What about the Catch being that his Mental Toughness is turned off on the Sabbath, on holy days, or during calls to prayer? I'm not sure what the cost would be for taking one of those conditions or any combination of them. The reasoning would be that whatever power blessed him with incredible mental toughness (Allah?) needs his heart and mind fully open during certain times of the day/week/year in order to maintain his spiritual purity. Those are times for reflection, confession, forgiveness of oneself and of others. When one has "shields up" they can't connect to that Higher Power in any real way.
What do you think?