Turn just ends. I have played several games where my turn just passes without me being able to do anything. I tried to play a blazing minotaur? on t3. After playing a raging goblin t1 and t2, and equipping one with Nahiris blade, attacks were fine. T3 i put the minotaur between them and turn ends, he goes back to hand. Played a willful smith t4 and equipped it i think. T5 and 6 ended before i could cast nahiris rage? And by then i was ready to concede, wouldnt even let me concede.
Has happened multiple games, vs multiple opponents. No timers appeared showing I was running out of time (and sometimes it ends when fuse is only half burned) and I hadn't used up time other than waiting for my cards to be readied.