Three
What followed couldn't have lasted any more than ten or fifteen seconds, but all those involved it felt far long.
At the door, Izzy was half turning back to Davis, stayed by the alarm in the latter's voice as was Kari, both of them trying to figure out just what it was that had him such a state. But by then the door was unlocked and open, latch free of the jamb, and all at once it was bursting all the way open with enough force to send Izzy careening backwards, tripping on the genkan most homes in Japan had. He didn't even have time enough to cry out in surprise before he was making a hard landing on the floor where he lay still, staring up at the ceiling above with a glassy, uncomprehending look.
By this point a man dressed in jeans, an off-white T-shirt and a navy-blue zip up jacket was entering the apartment, carried forward by his momentum from forcing the door open. In his right hand was a pistol with a suppressor threaded onto the end of the barrel, held at the ready for any targets. Immediately he saw Izzy lying on the floor, unconscious, and deleted him as a threat before looking for Davis and Kari.
Davis was still running towards everything, but on noticing the man was carrying a gun he changed direction for the kitchen where Kari remained immobile, transfixed by the imagery of Izzy being bowled over and the violence in which the door had opened, determined to get her into cover as part of his mind scanned the area for any kind of weapon he could arm himself with. Another part was telling him to move faster still, half-remembered stories and lessons dredging themselves up from the back of his mind, whilst a third part was screaming at him to protect Kari, no matter the cost.
Kari herself still hadn't moved. In one hand she had a cup of water for herself and one for Davis in the other, though on spotting the gun they both slipped from her hands in shock, eyes growing wide in response on recognising what it was. Her immediate thought was to call for Gatomon to help, only to remember she was away in the Digital World without any computers around to summon her with. Her next thought was to suddenly realise just how powerless she and the other DigiDestined were without their partners, especially against humans. In fact, barring the occasional altercation with Ken during his Digimon Emperor days, the only people she and the others had actually fought physically were themselves, and never for very long at that.
They were sorely lacking in that department and here it was now, coming back to bite them in the ass at the very worst possible time.
By now Davis had gotten to Kari and tackled her down behind the kitchen counters, out of the gunman's sight as he entered the apartment proper. As they went he made a mad scramble for the only weapon immediately obvious to him, one of the sharper knives Kari had used when preparing their sandwiches, but adrenaline and his own nerves kept him from getting a proper grasp on the handle so that he didn't actually grab it. Rather, the knife tumbled from the counter and by some miracle it managed to avoid cutting into either of Kari or Davis, who used the momentary respite to take hold of it, tightly enough his knuckles were shining white.
'One down,' the gunman said, clocking the moment to his left. 'Two remain, left side. Moving in.'
He stepped over the inert form of Izzy down the short hallway. To his right was a wall that had a few trinkets and photos attached to it, and to his left was the waist high counter his prey had taken cover behind. He quickly moved towards the end of it, pistol raised, where he expected to see Davis and Kari huddled together in fear. He was half right, as while both were on the floor only Kari was where he expected her to be, staring at him with a fearful look. Davis, meanwhile, was crouching right where the counters ended, and rather than having a terrified expression on his face it held a terrifying expression, an eerie calm that told the gunmen Davis had every intention of inflicting harm on him. And that was before he saw the knife.
It wasn't exactly a vicious thing, being intended for cutting meats more than anything, though in some macabre sense what Davis had in mind wasn't that far off from this. He had spent a scant second telling Kari to stay where she was before making his way to the end of the counter to wait in ambush for the gunman he knew was about to step around the corner of. Were it not for the adrenaline surging through him supressing his emotions, Davis would have been surprised at how calmly he was thinking despite the situation.
Certainly he wasn't baulking at the prospect he might be about to kill a man, the only thing going through his mind the various tales he had heard that seemed to guide his hand the moment the gunmen stepped into view. He seemed to hesitate for half a second, evidently expecting the pair of them to be huddled together, and Davis used this small opening to violently thrust with the knife into what he believed was the man's liver, twisting it once it was deep enough in, before grabbing hold of the gunman's weapon to tug it down and away from Kari.
To his surprise the gunman offered little to no resistance, though it could have just been a result of the adrenaline giving him nigh-superhuman strength. Whatever the reason, he used his newfound purchase over the gunman to bring him down to the ground, flat on his back, where on reflex Davis withdrew the knife to then plunge it into his neck. A horrid, wet gurgling noise came from the man alongside a spurt of blood as Davis withdrew his knife a second time.
A third stab didn't seem to be necessary as the gunman let his gun slip from his fingers easily enough, both hands moving to try and stem the flow of blood coming from the wound in his neck but it was a futile effort. Unbeknownst to either, Davis had nicked an artery and it was simply a matter time before the man died. Even if it wasn't a mortal wound, the deep stab to is liver was as another pool of blood was forming from it, far quicker than the one in his neck.
More to the point the gunman was no longer a threat, nor a gunman, technically, but something told Davis there was at least one more person about to enter the apartment. At least now he had a more proper weapon to deal with them so he moved again, this time so he was hidden behind the door, and aimed his newly acquired pistol at just about where he imagined the next gunman would appear.
Kari, at this point, now found herself paralysed by a newfound sense of terror after watching Davis, someone she had known since they were both kids and fought alongside countless times, effortlessly stab another living being not once but twice in the blink of an eye and without even a hint of hesitation despite the obvious implications of his actions. Worse, and perhaps the scariest aspect, was the utterly serene, apathetic expression he wore as he moved. It somehow made him scarier than the people storming her home.
Outside, the second of the three men that had come to the Kamiya apartment was just about to enter, pistol ready. He had seen his comrade go down but not the cause, the kitchen counters blocking his view. Best case scenario, he had tripped over something innocuous that would earn him no small amount of good natured mocking from his buddies after the fact. Worst case, he was dead but that seemed like an unlikely outcome.
They weren't expecting much resistance from these three, none of them having anything that might resemble combat experience. Most of the time they let their abominations do all the fighting, offering what was at best moral support from the sidelines but otherwise doing nothing. The three gunmen, however, had accomplished something like this multiple times without much in the way of injury. A bruise or two, maybe a split lip, so the second gunmen felt confident in his abilities.
He died before he could do anything.
Davis saw the tip of a suppressor appear from behind the door which told him someone else was about to enter, so he aimed his newly acquired weapon at where he roughly figured the next man was standing before opening fire, pulling the trigger five, six, seven times, which four times too many as the third round had struck the gunman in the side of the head after the first two drilled into his chest. He collapsed almost instantly, landing in a tangled mess amidst Izzy's legs, where he fell still.
Despite the suppressor the gunshots were deafeningly loud to Kari, though equally it could have been her senses being dialled up to eleven by the stresses of everything, the images of Davis viciously stabbing a man still fresh in her mind as he stood frozen by the door, trying to figure out if there was a third man about to enter. Two men would have been plenty to coral a trio of twenty-somethings into doing whatever they wanted but a third would have added an extra layer of security, and as the ringing in his own ears faded slightly he caught a hint of some curse being uttered in a language he didn't recognise.
The same instincts that had driven the knife into the first man and fired the gun at the second now threw him back to where the counters ended, where he had a view of the door, landing awkwardly atop the first gunman but managing to keep his gun up and aimed towards the entryway at chest height, waiting for the third gunman to appear.
Said gunman was stacked up next to the doorway and frozen momentarily as he stared down at the dead body of the second man, killed by a pistol which could only mean the first man was dead as well, as how else could any of their targets have gotten a gun? A furious rage soon erupted inside him. The men he had come here with were good friends of his, united in the righteous cause of ridding the world of those digital monstrosities and their human keepers, and now they were dead. Killed at the hands of the very people they had come to silence.
Were it not for the anger filling him, and had he some semblance of professional training, he might have planned his next few moves more carefully. He carried two flashbangs in his pockets, perfect for disorientating targets inside an enclosed place like a Japanese apartment, and it would have been easy to toss them both inside and wait for detonation before storming inside to overpower everyone. But he wasn't thinking clearly, and the people with training were attending to more important matters within wider Tokyo. All he could think about was making sure the people responsible for killing his friends suffered.
For Izzy it would be mercifully quick, a bullet to the head, but for Davis and Kari it would be longer, and far more painful. A round or two to Davis's gut that would down and eventually kill him, but slowly enough that he could watch as Kari was choked to death after she paid for her transgressions with her body in full. She was just lucky it was only one of them and not three.
He never got a chance to put any of this in motion though, as the moment he stepped into view of Davis the younger man opened fire with at least one of the rounds slamming into the older man's lung, forcing all the breath from his body. He staggered back and collapsed against the railing, surprised, struggling for a breath that wouldn't come as blood bubbled from his lips. His eyes worked though and they locked onto the increasingly hazy figure that was Davis.
The gunman used his last remaining bit of strength to raise his gun towards Davis and fire a few rounds but they went wild and soon it was falling into his lap as death drew near. A decidedly unfriendly smile, more a grimace, appeared on the gunman's lips that he threw towards Davis, imagining the hell that would soon be coming down upon him.
He died soon after.