Shoot the Boss Plant using normal Handgun or Kevin's Personal Handgun or Pill Launcher. Stand near an item. After shoot the Boss Plant un-aim to the Boss Plant, check the item immediately. These actions can dodge the rocks from ceiling. These actions can perform all character although the character does not have dodging skill. However, aim and un-aim rapidly will change your position. After many times of aim and un-aim action, you should re-location your position. Otherwise, you cannot check the item when the rock is falling.