Thank you all it has been solved!
Do you have any footage of what you witnessed ? Like a replay if you were using a deck tracker.
Are you sure their hero wasn’t immune ? Thanks to an Ice Block or a Time Out for example
Did you play SHudderblock before playing Astalor ? Your own shudderblock will negate the damage you rnext battlecrie deals to the ennemy hero.
Sounds like you might have played Shudderblock before playing Astalor.