Though barely conscious, Ares could feel Deimos' weight against him. Yes, his actions had more severe repercussions than he thought.
If he only had looks to go by, Deimos looked dead. But Ares would know if one of his children died, and Deimos was definitely not dead. Barely conscious but certainly still hanging on by a few threads.
At a time when Ares should have been doing something - trying to secure the safety of his children, trying to do something more against Eris - it felt wrong to be lying here in whosever bedroom it was.
But the thought didn't last. Nothing lasted long enough to persist beyond fatigue, beyond sleep.