[SirFozzie]

he could be hoping that the seer would say "If I scan him and he's not.. then I've wasted a scan.. best to take him at his word."

Or... he could be trying a 1-1 switch. Chaos with the abilty to take someone down with him, maybe? Seer scans him, finds out what he is, and announces it to the world, exposing the seer.

Again, don't take him at his word, but don't automatically assume he's lying either.