I was playing around with the mobile version of Terraria on my new phone (I find it really hard to play) and I discovered this bug on a LAN serer with my sister. Basically when your boomerang, (In my case, the Enchanted Boomerang), is still mid-flight, and you die before it comes back, it will freeze, but keep spinning and decimate anything that touches it! When you re-spawn, it will begin to move again and fly back to you. I was surprised when i was trying to defend my sister from the eaters, and my boomerang which froze when I died, and destroyed the eaters.