This is a little mod I made for myself back in 1.2.5(there is no 1.2.5 release, dont ask), and I quickly rewrote it for 1.4.2 as I think others would appreciate it too. It was originally thrown together as a fancy debugging tool, but it gives the game a bit of a... rpg feel, so I thought I would release it.
When anything living takes damage, the damage they took will bounce off their head, with a cool little effect.