This is about encounter 2 of Reclamation (Labyrinth of Ruin), where the objective for both sides is to gather 7 objective tokens (in a 4-players game).
Let's say heroes have already 6 tokens in play, and have the hero carrying the Sun Standard trying to attack a monster to get the seventh token and win on the spot.
The Overlord also has 6 tokens in play.
He plays Reflective Ward, both hero and monster die to the attack. Both sides gain an objective token. This occurs simultaneously.
Who wins?
Edited by Indalecio