You know the situation: the players have decided that splitting up is a good idea. Maybe they’re on a shopping trip, maybe they’re investigating a dungeon/mothership, maybe some of them were arrested.
What’s the best way to handle the situation outside of combat? How do you keep it interesting for the players, while moving the story forward?
Here’s a trick I saw on a let’s play a while back: have the players whose characters are not in the scene play NPCs.