I am sure when the person was being eaten by a lion their body was in pain but we do not know what state their minds were in. It is very possible that their minds were with God so they felt no pain of the body. It has been shown many times when people are in excessive pain that their minds will detach from their bodies and they do not feel the pain, they become numb, how do we know this is not God's way of helping us through that pain?