In one of the RPG's more brutal moments, Rex beat a Mutant Lizard to death with a metal pipe. While PeabodySam did not go into much detail regarding the lizard's death, picturing the event itself can be unsettling.
A more traditional example occurred early in At War's End in the form of Rotor and Garry beating the crap out of Jenny. Tom attempted to get revenge on Garry, except the latter being ex-military, he was able to fight back.
Colonel beat the crap of Commander Vinyaya outside of the Pharaoh's Forbidden Ruins.
Ghost decided to viciously beat Minerva in hopes of knocking her unconscious so he could take her to Ahua.