We just played the Ecthar Boss and finished him barely in time of the damage phase. As he died the text of upping his shields again was already displayed. After he died the health bar disappeard just to reappear seconds later with 1 cm of health left and full shields. All other enemys death, no way to down his shields again. No runes, no Knights and no exit. He remained stationary and immune. Is it a bug or are we too stupid to get to the end?