When a spelunker dies, in either Co-op or deathmatch (if selected), they become a spelunker ghost. Spelunker ghosts can blow puffs of air, which can push items, push and stun enemies (not all enemies), and resurrect bone piles when passing through them. In co-op, if your partner died, you can go to a shop, make the spelunker's ghost blow at the shopkeeper, (that will cause the shopkeeper to stun and drop the shotgun)grab the shotgun while the shopkeeper is still stunned, shoot him 3 times to kill the shopkeeper and rob the shop!