He notices. Song English, Pyay mweelsrow... they seem to switch off fairly frequently. He starts wondering how it works, in there, how they can be in sync yet maintain individual personalities.

...Insofar as they have individual personalities. Do they? He hasn't been trying to notice for very long. Song is maybe more relaxed and agreeable, Pyay maybe more focused and intense? He could just be seeing patterns where none exist.

There's a door marked "Linguistics Graduate Commons", two doors down from the stairs. He knocks.