Because the rule says "regardless of the outcome", it means whatever would happen in the roll still happens, just that 1 Hope and 1 Fear are also generated; so if the player rolls with Fear, the GM still gets to make a GM move.
Another way to understand the move, is that you're paying 3 Hope to give another player 1 Hope, and the GM 1 Fear. This is useful since many of the Heretic's features are affected by how much Fear the GM has.