OOC:
WelI did say that, didn't i? Anyhow here is the narrative:
Thorem moves into the door. He notice that creature paused his work and stare at you, but does/say nothing.
Bellow is next and feel hot breath of the hellhound just 5 feet away from him
Hellhound barking behind Bellow - everyone hear the aggression and even feel fiend's bloodlust
Anguis allow hellhound moving in front of him and put his effort into holding the rope because hound certainly want to move forward and behaves aggressively.
Mal is 5 feet behind Anguis
When hellhound reaches the door it opens it's mouth for the firebreath.
OOC:
Roll initiative. Anyone who think they are surprised by course of actions at the surprise (Anguis(?)) - but I will let players decide that. At least the creature staring at you are in noway surprised