I don't want to sound like a nay-sayer with the whole D5 thing (I know, I know…double meanings), but I think it's clear that D5 is a reference to checkmate in Through the Looking Glass, which is why Q keeps talking about "Think Mirror".
I don't want to sound like a nay-sayer with the whole D5 thing (I know, I know…double meanings), but I think it's clear that D5 is a reference to checkmate in Through the Looking Glass, which is why Q keeps talking about "Think Mirror".