Key to Time... I command... that you stay exactly where you are!
[He hits a control on the TARDIS console]
Doctor! You have fully activated all the TARDIS's defences.
We can't be too careful, can we? And it would be a terrible tragedy for the universe if it suddenly turned out that I was colour blind...
Doctor, release the key to me immediately!
...unable to distinguish between the White Guardian and the Black Guardian.
Doctor, what do you mean?
LOOK!
[The Guardian shifts colour, revealing himself to be the Black Guardian]
Don't you see? The White Guardian would never have had such a callous disregard for human life.
Of course! Astra, the sixth segment; he would have dispersed it immediately.
Doctor, you shall die for this!
I think not! Remember, the Key to Time is still mine. Rage all you like!
I shall destroy you for this! I will disperse every particle of your being to the furthest reaches of eternity!
Oh, well, I wish I could stay and watch you try, but you know how it is. Places to go, people to see, things to do.
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