That's not a bug, that's how the original works, you have to walk them to the exit to rescue them. As a bonus, if you continue, you can start the second quest with whoever you had left at the end.
Yeah, I wasn't sure about it, but went ahead with it. If I move it along, I might add a timer after all the mobs are killed to give the player a chance to kill all the mobs and still rescue the other character.
