is it a kind of dream?

Planet of Fire pt One - 5 minutes in, first scene on board the Tardis. Turlough tells the Doc he's becoming obsessed, he agrees, obsessed and depressed.

Turlough: 'You miss Tegan?'
Doctor (defensive look at T, then sullen look down) : 'Well, we were together a long time.'

OMG. Why did i never see that before?

Or maybe the old Doc just feels guilty about how she left, why she left, etc.

I smell fic, i do i do i do.  Fic fic fic fic. Come 'ere ya wee timorous beastie of a plotbunny...