I'm having a hard time figuring out what happens in which phase (movement, Arkham Encounters, Other World Encounters etc). Does Combat happen in movement or in one of the Encounter phases? From what I understand, everybody's turn happens at once, so if two people move into a space occupied by a monster in the same turn, does only one person fight it?
Also, in which phase can an investigator try to close and seal a gate? Is that during movement or encounter?