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2. You do not play all the Enhancements at once with Arrogance, it just gives you infinite initiative. It is not an "umbrella" type ability like ITB is.
2. I would think that removing the EC would stop the others from activating.
Scenario: My opponent starts a rescue with warrior class btn banding chain. I use Unholy Writ, CM, etc. to take out the btn guy. I then block with an evil character with horses to interrupt the battle. Question: Does the btn ability kick back in after the interrupt or does that effectively stop it and make abilities work again?
Scenario: I block and play arrogance and choose 4 evil enhancements. I then put those evil enhancements in battle and they are activated but I carry out their abilities one at a time. The first enhancement I use is the one that interrupts the battle and returns the character to hand. Do the rest of the enhancements still take effect? They need someone to activate on but they have already been activated so it seems like they would.
Actually horses doesn't interrupt the BTN ability because it's not in battle to be targeted by the interrupt the battle ability.