Necromorphs have a bad tendency to lay around and wait until you're close to them before leaping up and sinking their claws into you. If you happen to come across one that looks relatively intact, and you're not sure if it's still alive or not, use your abilities. The Kinesis Module does a world of help if used correctly. Simply aim it at the enemy to test it. If the Kinesis Module has no effect on the enemy, then it's still alive. At that point, feel free to pump it full of as many rounds of ammo as you want.
Added by: Forgoten_Scars Mar 10th 2011, ID#3724