Yes, definitely time for Thanatos to intervene. "Mort, come out of there now."

He hears Mort squeak something about fighting an enemy with the powers of Lord Zeus, and more of what sounds like a battle in there. Thanatos doesn't sense anything, but that just means he can't use his powers on it. He can still fight by other means.

"I can't help you if you don't get out of there."

Is this something to be concerned about? An intruder on the train?