Here is what you do, if you are facing the wimp who will not pull the lever,turn to the right and go get Zeus's Fury{lightning bolts you can throw]come back,chunk a couple of bolts at the scared dude. Go drag the crossbow to the platform,pull the lever,pull it OFF of the switch,pullthe switch,push the crossbow back on the platform,pull the lever,drag the weapon to the middle of the room and fire it. Hope this helps.
I've played resident evil 1,2,3, and am almost finished with 4. Nothing is cooler than turning off the lights and getting submerged in these games!