I was just in a fleet battle. Both our Houndstooths had their taunts up, but the enemy Vader was both breached and target locked, and almost dead. So I bring in Slave 1 for the hits on target locked enemies, and use his special. Vader evades, destroys Slave 1, then Hounds tooth. Now, breached should be giving Vader -25% evasion chance while Hounds tooth is present, yet he still evades.