Panic rushes through your mind as you cast around looking for something you can use to cease the madman’s rush. You take a few steps back to buy yourself more time and, with a sickening *CRACK*, fall backwards over a wooden chair.
You scramble to your feet and, ducking underneath Jack’s flailing grasp, manage to pry one of the legs free of the broken mess you’ve made of the chair. Though your back is turned, you hear Jack’s footsteps moving towards you from behind, lash out blindly with the leg and somehow manage to connect.
You hear two satisfying thumps. Your weapon thumping against Jack’s skull, and Jack thumping against the filthy floor, bleeding slightly from the wound to his head.
You drop your weapon and move across the room, trying to look innocent — but you don’t think you fooled the orderlies who are now flooding through the door.
A few of them grab you roughly by your clothes and with no explanation begin to half-carry, half-drag out out of the room.
The leading choice was “Search around for an improvised weapon” which narrowly beat out “Try to tackle him and take him down.”
The roll to find a weapon was a success, but very narrowly — hence the scrambling around.
Jack’s attempt to attack you, once you found the weapon, was a failure.
The roll to attack Jack was very successful, though not critically so, and as such allowed you to fend him off effectively (with no harm to yourself), but still left him alive.