Kneepads of Allure when at level 8

[MunchkinMan]

You can not use (or benefit from) the ability if winning the combat would win you the game. If you use the ability when it was legal, and then conditions change such that you would now win the game by winning the combat, whatever "spell" was compelling the player to help you is broken and the helper leaves the fight.

This is different from regular combat rules concerning a helper's ability to leave, but since these cards crate specifically different conditions, there's no reason to infer that the regular rules for combat should be ignored just because of one or two (or three) special cases.