>>8621999You can take the helmet off as long as nobody's around to see you do it, but yeah, according to the creed, once that shit comes off in front of someone you can't put it back on. But meeting all these other Mandos that don't follow the same creed as him has shown him that "the way" isn't really the only way, He's slowly been getting more comfortable with the idea of taking the mask off.
Plus, everyone that saw his face in the episode died or "died" so it's fine.