The guard grabbed at the collar of Hal’s labcoat, but Hal grabbed the gun that was hidden under it. 

He didn’t think. He didn’t have time to think. The man would have crushed his windpipe, or broken his skull to a pulp if he’d taken time to think.

Trembling, he pulled the trigger. 

Again. 

Again.

The big man’s grip went slack, and he stumbled forward, pinning Hal between himself and the wall. Hal made a strangled noise as he felt the man’s sudden dead weight against him, the hot blood pouring over his clothes. 

Hal’s vision swam, and went dark.

AO3 Link

Written for @febuwhump day 10 prompt: Killing in self defense.