If a creature with aggression is moved into a space with a survivor and neither the creature nor the survivor dies after combat, what happens?

Aggression only triggers when a player actively enters the space of the creature. So if they both survived the enemy phase combat, they'd just be in the same space giving each other the squint eye..

Correct. Aggression requires movement on either party's part. The presence of any enemy still blocks many actions, of course, but no more fighting unless someone else enters that space (or the mob moves into someone else's space).

Perfect, thanks.