https://replays.firestoneapp.com/?reviewId=6a7f99b0-0f61-419a-9445-d95e927d15e9&turn=17&action=4
I used Lady S’theno to kill my opponent (Warlock Hero 1Health/5Armor) while using his own spell (curse). She decided to attack the 4 HP minion instead of the 1 HP Hero.
So either its a wrong mechanic with the curse or the enemy Warlock Hero. In this specific case the armor might have counted as health which usually doesnt happen. Almost costs me the game.
Regards