Pin the Fan (pg 181) does damage/critical equal to two times [weapon value] plus bonus successes. Are the successes added before or after doubling?

The Body of Anvil (pg 186) keys off 'succesfully defending', what does this mean? As far as I can tell succesfully defending means you took fatigue damage, but I assume Body of Anvil is meant to key off damage being reduced to 0.

Pretty sure on Pin the Fan the you double first, then add successes. If you doubled everything, it would have to include language such as "twice the sum."

Math says multiplication before addition.

As for Body of Anvil, I'm fairly sure "successfully defending" just means "defending". You can't defend unsuccessfully. You either defend or you don't.