"only XL-5"

Dima hoped for the best and realized it too late, but he was the only one who actually realized it.

What else could Dima do? Could he just not message on ICQ and behave modestly, trying to resolve the situation with minimal losses, without bothering anyone? It wasn't possible to come to an agreement with the opponent – he asked for an ODD (one-day delay).
Not everyone can do what you do. But remember this: after you persistently asked to finish the game, you were called "brain-bomb," "curator with a sick head," and banned on the same ICQ when you were just defending your rights and your personal time.
So, Dima would have ended up in this situation anyway. Moreover, this has already happened for the second time in this tournament; the first time was right after the group stage.