Grimrock

I had problems with this one too, my brother came down and told me what to do

When I get poisoned by spiders, I can rest to heal my poison. Is that a bug, or is that a part of the game? Maybe it is my normal difficulty?

Sometimes, if you walk away and go back, your characters will push it so that you can. If it is a throwing weapon or an arrow, though, as long as it was one that you used, it will re-equip it when you step on it.