Murphy turns to stare back out into the strange nothing. Before he actually yells out, "Warren! If you're out there, I'm about to get on this educational cartoon train! So if you need to come find me, that's where I am..."

Because if anyone would come looking for him, or would be out there looking for him, it would be her. And he lingers just sort of... watching, sort of hoping, before he picks up his pack to go towards the train grumpily.