I had that happen to a friend in Saw last year, he was picked off the back and made to go round the maze again! I really did think he had gotten into trouble with an actor lol.
Personally (if we get a conga-line maze), I'd love to see people just picked away from the group every so often and left to wait for another group / venture the maze alone. Much scarier not knowing what's happened to the person who's been left behind!
Wow I love that maze the sets are just really great! And it's not one of those mazes where it's just pitch black!