Double Sided Stance Cards Question

[GatorCuban]

On page 12 of the Core Rules regarding double sided stance cards it say "A Unit that has a double-sided Stance Card may flip its Stance Card to the other side once per activation, at any time during its activation. When it does, the new face up Stance becomes the Unit’s Active Stance".

My opponent that I was playing with today was the attacker and he attacked me using one side of his stance card (He did not flip the card upon activation when he attacked me). Then my special ability from Lord Maul allowed me to roll 5 dice and attack him back. So, he then flipped his stance card to the other side because it had better melee defense than the other side he used when he attacked me. 

My question is is he allowed to flip his double sided stance card like that in the middle of my special 5 dice roll attack from Lord Maul to give him better melee defense?

[Thoras]

This is answered here

 

[GatorCuban]

I'm sorry but I still don't understand.

Please carefully read my original situation again. I was being attacked (My opponent did not choose to flip his stance card to do this) and my character Lord Maul took damage. Then my character Lord Maul used a reactive special ability and allowed me to roll a 5 dice attack back to my opponent. Right when I declared my reactive special ability to roll a 5 dice back at him from my character Lord Maul he then said he could flip his stance card to the other side so he could have better melee defense dice roll because he had not flipped his card yet during his activation. I told him I didn't think he could do that but he said he could according to the Core Rules.

My question is, is he allowed to flip his double sided stance card like that in the middle of my special reactive ability 5 dice roll attack from Lord Maul to give him better melee defense? Yes or No?

[Negoldar]

You cannot flip a stance card while another effect is resolving. In your described situation, there is no moment where nothing is resolving so the card cannot flip.