The training droid disc says that the enemy goes Tenacity down at first but can’t be reduced below 1% until the leader falls unless an annihilate attack is used. Fine: I dismounted the droid disc and tried again, High relic CLS squad vs Mandalorian. The Mando leader Bo-Katan was quickly taken down to 2% or so but would not go below that. In short order I reduced most of the Mando squad to 2% or so and Stunned 4 of them, including Bo. None of them would go down, and this was with no droid card mounted.
Given the write-up of the droid card, if it’s active, the enemy’s Tenacity is down but the squad won’t fall until the leader toon is out. Fine. But if she can’t be taken below 2%, then nothing goes down. If removing the card has no effect, then the programming is buggy. QED.