Incorrect ability descriptions or bugs?
Several units have abilities that state “the first time [x] would be defeated, [y] happens instead”. However, this doesn’t match what happens ingame. For example, ISC’s Unique “Super Commando Beskar...
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Conversely, Jyn Erso paired with Admiral Raddus with his Zeta Unique ability upgrade cannot be instakilled. I just had a Squad Arena battle where Jyn was targeted by Jabba's Ultimate Ability and she survived, albeit with 1 HP.