Keep in mind Leben has (or had) a ridiculous chin too, and Wandy tagged him hard. Leben said himself that he was pretty much on autopilot when he started throwing those uppercuts.
Stann has a solid chin, but I don't see him triggering berserker mode when he gets popped.
Stann also happened to put Leben out, except he actually put him out unlike Wand.
This is just a bad match up for him, Stann can eat one and the one he can dish out will be more than enough on current day Wand.
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