NYSSA: You can't argue with mathematics.

TEGAN: Tell that to Adric. How did it work out for him?

(Nyssa gasps.)

DOCTOR: Tegan–

TEGAN: Sorry.

AETHER: Who's Adric?

DOCTOR: Our friend. He died, not long ago.

AETHER: I’m so sorry. Death is an unwanted companion.

NYSSA: You also know of grief?

AETHER: When you're my age, my dear, grief is stitched into living. It just depends how you wear it.