I wish Inno would show who pressed the perk button, like the way they have a notification of someone who pulled the flag on the FA. When a fellowship has a lot of mages and none of them will own up to it, it can be maddening, particularly when you are saving up for a push.
If it was shown who pressed it, there would be a LOT fewer accidents. People hate to have everyone know they made the boo boo, and they are much more careful not to do it again (and if they aren't, they can always be reduced in rank ... hard to reduce everyone just because "someone" did it.)
In your case, with only 2 mages, each one of you will be certain the other one did it, lol.