Exactly. By the rules we have to just auto-resolve him as doing nothing, but I don't think that would be rather fair. We need to do something however...
Maybe let someone else play him for a turn and he has not shown back up by the next time he is needed we sub him out?
It'd be fair by the rules, but I don't like autoresolving him either.
If we replace him it'd have to be for longer than just 1 turn though. I don't think we should waste a sub on a 24 hour substitution of someone who might not be back for much longer. Don't forget that that person would then be unable to sub for anyone else as he knows Saintis' hand at that point.