I keep getting the hearts beaten out of me. But look at that skull on the ground. That's wasn't there last time. I'm going to shoot at it. It gave me a heart! That's nice. Later... the game is loading up a new Zelda level and it's mentioning something about those skulls which—oh!—they show up where I last died in the level. So they were my skull. I was scavenging my corpse.