Dam the Man wrote:
I'm going with C. Pure Fury is straight up defeat, he doesn't give you 13 Attack for 13 KO'd SHIELD cards and IFF requires you to spend when fighting (Black Widow's rare would go past IFF too IMO in this case against Sinister with Bystanders, as would Forge's rare with two previous Tech heroes played).
Rauli is correct. Invincible Force Field only requires the spent points to Fight the mastermind, not Defeat them. You essentially skip the "spend attack to fight" step when you "defeat" an enemy.
You can find reference to this in Dark City's rule sheet, and how defeat still triggers fight effects, but ignores abilities like zero and forearm, whose texts say "to fight...." So A is wrong.
B is wrong because of the reasoning for A plus because Pure Fury doesn't give you attack points he just defeats an enemy, as Rauli said, so he wouldn't take away from the force field anyway.