Mort squeaks FITE ME! that Lagos implied it and is rude to think he hasn't been doing everything he can to help Thanatos out. And of course Thanatos listens to him when he talks, but Thanatos is still Thanatos!

Thanatos lays a hand on Mort's head and brings him closer to his chest. That also creates more distance between the two Chthonic Companions.

"Whatever Lagos's wants at the moment, it doesn't seem urgent or important enough to rile both of them up while everyone else is trying to rest." These two are causing a ruckus, and they are probably getting stared at. "I need to get back to work."

Yep, Thanatos is walking away and taking Mort with him.