Okay, so say you get a headshot with like an extremely powerful sniper or weapon. The head of the victim could be shot off and lost to the world. This isnt gamechanging, it would just add some nice goriness. Also, if a head is shot off it could make it so a Detective cannot see the last seen person when searching the body. Please consider -Mister Anal Hamster
It was never coded in. Also Chivalry uses Unreal. TF2 has explodable limbs too though so it's not impossible for ttt.
I don't think it would be possible for all the skins, unless we made a model for each head of skins that we would spawn in.
When heads are taken off in TF2 they just shrink the head and spawn another head gib, the head isn't actually removed.