When all was said and done, Roy quickly undressed these guys of their clothing, weapons, and even underwear as he left the bodies for his beasts.
If someone saw him do what he did, they would certainly think that he was quite the stingy, and unscrupulous guy, as he even took their underwear away.
Who does that?
But considering his situation, and the lack of all that good stuff in the tribe, who could blame him? It had been quite a long time since he had been able to wear some good clothes and underwear.
There was no way he was wearing them directly as he would first have to wash them really well, but the fact remained that from now on he would be able to wear underwear.
Going commando was good as well, but he wasn't quite a fan of going commando. So he was forced to take even their underwear away.
Furthermore, these guys wouldn't need this stuff anymore, as they would end up as food for his beasts.