Mace Windu Shatterpoint Timing

[mythicFOX]

Can Mace Windu change his stance between being chosen to activate from a Shatterpoint card and his Shatterpoint ability checking which stance he’s in?

[KoseyW]

Is Mace Windu able to switch his stance before the effects of the Shatterpoint ability take place?

I ask because in the rules it says a unit can switch it’s stance at anytime during it’s activation, I assume Shatterpoint takes place before anything else can happen? 

[Thoras]

@mythicFOX@KoseyW

No, he may not switch his stance before the check occurs.

Changing his Stance is an "Any time" ability and those can't be used while other things are occurring. In this case, you are resolving the Shatterpoint rule immediately upon choosing to activate him and thus cannot perform an "Any time" rule.