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For Blitzwing in bot mode, do you always flip to alt mode after battling, whether on attack or defense, or only after flipping an orange and blue during the attack phase?

It’s all one ability. You won’t flip Blitzwing unless you’ve flipped an orange and a blue battle icon during the attack.
Source: Wizards of the Coast (2019-02-28)    【Link to Ruling】
Tags: Blitzwing, Relentless Foe