Mundane: “The Power of Heart” move

Last night we run a mystery and our Mundane has this move:

The Power of Heart: When fighting a monster, if you help someone, don’t roll+Cool. You automatically help as though you’d rolled and got a total of 10.

Our Mundane, Isaac, had also Cool highlighted. My question is: does he still mark experience (even without needing a roll)? I think no, but I’m looking for confirmation.

Correct, the move happens instead of the roll and experience mark.

If the Mundane really wants the experience, they have to make the roll.