Show "KILL" Instead of Damage Dealt When Killing a Zombie

I was playing GMT Zombie Massacre, and I liked that when you killed a zombie in ZM, instead of just showing the amount of damage you dealt, the shot that killed the zombie said KILL:

It’s a lot easier for me to notice than the skull that appears when killing a zombie in TU, plus it’s useful for me to know which shot specifically killed a zombie, so I’d like to see this in TU as well