thneedly is right the demons I know say they can't be hurt with even holy water
as a matter of fact two of them I have seen go right into a church with no prob
and I have crosses in me bedroom
I am sure you have heared of thoses ones that trow crosses a cross wont hurt them and if the exorsium had not work he might be dead so be careful when trying that
believe me,thneedly,and vince
if it was powerful enough to take over him then it should be hard to get it out
so ether your friend is 'bonkers'
or faking or you were lieing
or he has a weak mind