I recently played a quest (as the overlord) in which I used kobolds; one of the heroes I played against was Leoric of the Book. My question concerns the "Blasting Rune" and monsters with split. My opponent used Leoric's heroic feat with the blasting rune and was able to take out many a kobold. The issue however is about whether the newly placed kobolds take damage from the blasting rune or not.
The split ability states: When this monster is defeated, replace it with two minions in the closest available empty spaces, ignoring group limits .
The Blasting Rune's ability says: When a monster is defeated during an attack with this weapon, each figure adjacent to the defeated monster suffers 2 hearts .
My opponent said that since this takes place during the heroes' turn, he gets to decide the order in which these things happen (as both of them happen when a monster is defeated). Thus when one of my master kobolds was killed, he was replaced by two minions who each took 2 hearts.
Any thoughts on the validity of this ruling would be well appreciated.