Find the fire extinguisher in the hallway and use it to pummel him. He's twice your size!
From Create Your Own Story
You reach for the wall, running both your hands along it quickly until you find the housing for the fire extinguisher. Quickly, you unfasten the strap that holds it and get it up into your hands just as you can see the man trying to stand. You raise the heavy metal tube above your head and then bring it down swiftly onto the crown of his head with a loud clang.
He collapses to the floor, groaning, fingers twitching, blood oozing from a nasty head wound.
