On the gunsmith red side where you can roll the dice again
if using dynamite can you re-roll both of the dice again
With “MIGHT IS RIGHT,” the Gunsmith lets you "play your duel tile after your opponents."
If you have used dynamite, "you would also spend two duel tiles."
The question then is whether you can play both tiles after opponents.
If it were the case that you play one face-down and one after opponents, I think that the rules would say so (it's kind of an odd result).
Thus, I think that you would play both duel tiles after opponents.
Thus, I think that you can re-roll both dice (if not playing “MIGHT IS RIGHT”).