Dib lifted his head at the sound of voices. Had he passed out? He blinked as a light shone over his face, blinding him to it's bearer.
"Hey, are you hurt? What happened here?" the light lowered and a man in uniform stepped towards him, flashlight in hand. Another policeman followed beside him, shining his own light about the stairwell. The cop crouched down beside him and looked him over.
"Alright, we're going to get you out of here, just hold on." He pulled a radio from his belt. Before he could speak an inhuman screech echoed down the stairwell and the alien dropped from the floor above them, landing on the second officer. A metal extension stabbed through his back, driving him to the floor as another sharp tip crushed through the back of his skull. The first officer reached for his weapon but the Irken swept an extension, knocking him against the wall.
"No!" Dib cried out, lurching forward, arm outstretched as the alien drove a metal leg through the officer's chest. The man stared in shock before he was dropped, dead.
"No, no, why the fuck!" Dib tried to get up, forgetting himself, and fell back against the wall. "Fucking why?"
The alien crouched on the bottom step of the stairs leading up, watching him silently. He waited until the human was finished yelling, then reached out a PAK leg and turned over the body of one of the officers. Dib watched in muted dismay as Zim flipped open one side of the officer's coat, revealing a hidden badge. Dib leaned forward and grabbed it and a flashlight. He read the badge, then looked up at the alien, sitting back against the wall hard.
"Agents," he breathed. "How did you know?" He leaned forward again quickly and searched the officer, drawing his weapon and slipping it into his pocket. "We have to get out of here."
The officer's radio crackled to life. "Agent Reen, status. Are you ready for pick-up?"
Zim crept forward and snagged the radio, pressing the button and bringing it to his lips, eyes on Dib. "Negative. Target eliminated. Send clean-up." He spoke in a perfect imitation of the dead agent's voice.
Dib stared at him but somehow didn't feel the level of disbelief he thought he should. Of all the things he's seen the past few days, this was likely the least surprising.
He got his good leg under him and put a hand to the wall, attempting to stand. The alien dropped the radio and picked his way over the bodies to the stairs leading down, then looked back to wait for him. Dib set his bad leg down gingerly but could put no weight on it, almost crashing to the floor again but catching himself on a rail. He stared at the floor, shaking. The alien crept towards him slowly and he looked up at him warily. The Irken hissed quietly and moved away, swinging over the railing and down into the darkness. Dib started down the stairs slowly, one at a time, hopping on his good foot and supporting most of his weight against the rail. He had approximately fifteen minutes to get out of the building and away from the site.