"We don't just need him to believe that you can't take it off, we need him to believe that you can't take it off even with a Fox's Cunning.  Also him asking you to do something that feels like dying is one thing, him asking you to lose a couple of spell slots is another.  And if his headband is really +1 instead of +4, does he notice that he doesn't get as many extra spell slots as he should?  We have to tell him that you only gain as many spell slots from your +4 headband as he gets from his actually +1 headband."

"We don't just need him to believe that you can't take it off, we need him to believe that you can't take it off even with a Fox's Cunning.  Also him asking you to do something that feels like dying is one thing, him asking you to lose a couple of spell slots is another."

"And if his headband is really +1 instead of +4, does he notice that he doesn't get as many extra spell slots as he should?  We have to tell him that you only gain as many spell slots from your +4 headband as he gets from his actually +1 headband."