Ok, so I'm in the last room with one heart, and its right before the last boss fight. This has been my first run-through and has been really easy so far. Before I fight the final boss I scavenge for more hearts. Soon I find a chest behind a stone wall, but its ontop of a stair case so throwing a grenade at it is not so straight forward. So I jumped and timed my grenade to hit the stone wall. However, IT DID NOT EXPLODE WHEN IT HIT THE WALL BUT BOUNCED BACK AND KILLED ME. so mad I uninstalled and decided to tend to my family and never play any more games ever again.