While Dana and most of the others were following the opposite branch of the tunnels that Rae was, in order to clear out the Tunnel Worm nest more quickly, Karl was silently checking the area around the spots where they usually found things related to the Manticore.
They had found one tunnel so far, hidden from everyone who had done the dungeon. And his team had found more good stuff hidden on lower levels last time by sending spiders down into traps.
So, there was a chance that this time they could more thoroughly explore those less travelled regions, and perhaps find another group of monsters.
That would give them two out of three, and hope that this was an actual full dungeon, whose mechanisms everyone had been missing.
Naturally, the miners had noticed what Karl was doing, and they were hoping that he knew what he was up to, as he had left the fighters of his group to go and clear out the Tunnel Worm nest.
