So a few sessions ago I had to write out a player due to them having some personal matters to attend to. Now they're back, and I want them to be in the next session, but the party is currently in a underground temple with only 1 entrance that locked once the party went through the door. How can I re add the players' character and have it make sense, I don't wanna just say "She magically appears or She was with the party the entire time."