PS +end in a self-rez?

Resurgence is the self-res power for Willpower. As such, it hardly ever gets clicked (one hopes) But Mid's indicates it will take a Perf Shifter Chance for +end. Would the proc work when Resurgence hasn't been clicked? or only when it's clicked?

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If we are to die, let us die like men. -- Patrick Cleburne
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The rule is that they must be loved. --Jayne Fynes-Clinton, Death of an Abandoned Dog

Each time you use Resurgence, it'll have a chance to give you some endurance... totally not worth the slot.

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