This method of killing and disposing of enemies seems to be highly ritualised.

They scalped them, cut their tongues out, cut off their arms and legs and piled them up on the fire that they'd been using to roast the leg of the Comanche warrior.

Could this be related to their religious beliefs i.e. could the dismemberment of the warriors be something to do with crippling the warrior in the afterlife?

Fascinating piece @janton U+R