Sad to see... (S6E8)
Astrid go out like that. Quinn got her killed thinking she was against him but seeing the agony on his face and in his voice stutter and all trying to warn her so badly hurt more as he realized his mistake in the end. Seems Astrid had more than just a crush on him while Quinn only thought of her as a friend :/
Good thing his previous training still has paid off by holding his breath for a quite a duration of time.