(Still 6, 1 year later)
Things had been somber after Tony passed away that awful, awful day. Loki had kept up with his studies, but some of the life that had formerly been with him had faded. It had been a hard time, and for him it was barely a few months. Still, he squared his shoulders and did his best to keep going, even if he still broke down in the corners sometimes. He had been spending more time in the lab with Bruce, it was a connection for them. Sometimes it almost felt like Tony was there with them.
Loki had been helping Bruce with his research, to the best of his abilities, in which he had been trying to reverse the gamma radiation. The Hulk wasn't really needed much anymore, with rows of new superheros being organized by SHIELD. It was getting late so he had been sent off to bed.
Some four hours after he had finally managed to fall asleep, the alarm bells sounded. The little raven bolted straight upright in his bed, tossed off his covers and darted into the hallway. Natasha was already out there and making her way towards the lab, where Bruce was. Where the alarms were sounding from. As fast as he could move on such small legs, he ran down the hallway, screaming in his mind for this to not be what he thought it was going to be.
Unfortunately, it was.
Behind the glass wall that marked off the lab, Loki could see the slumped over body of Bruce, laying motionlessly on the floor.
In a burst of magic he had never thought possible, he managed to teleport himself passed the glass to the body, despite Natasha's attempts to stop him. Green light crackled in the air as he funneled all the magic he had left into trying to heal the man before him, but much like with Tony, there was nothing he could do but sob.
It was two hours before anyone else could get into the lab, and another four before they could get him to let go of Bruce's lifeless corpse. Later still, he would be told that the radiation in Bruce's body had reacted poorly with the radiation of a lab experiment and there would have been nothing anyone could have done. No way to see that coming.
Somehow that didn't help Loki feel like anything less than a failure.
The time after was lonely and cold. It wasn't a good cold either. No, it was the sort of cold that takes over when one has lost more than they could ever regain.