I still don't think putting their severed heads up would count well towards either slow and careful, but maybe we can compromise?

How about putting up one head, and the rest get sent back to Achamoth in bags? They can do what they need to with them over there, and we'd still send them a similar message if we dropped them off at their gates.

[ He's trying his best to find a solution he's somewhat morally okay with, but even one head is going to needle at Thoma's strong moral fiber. ]