Forget the ski mask. I prefer for those who get a beating from me to know it was me. This way they will never put themselves in a position to get another beating.....from me atleast.

On a side note just get it fixed and move on. Lesson learned. In this situation there is little that anyone can due to prove he didn't know about the issue being as severe as it ended up. Sorry for the bad deal but but save yourself the frustration and just make the repairs. Then treat yourself to a nice baja adventure to celebrate your truck while he hopefully is crashing off a cliff in his new whatever.