Calm? Stay calm? That's not helping! What's going with his body? Wait- this was in his class; about regenerating - but - already?

Don't mind as Theta; rolls onto the floor and bursts of energy come from his arms, legs and head - and grows into an adult body; which then becomes an old man, and another, another, another, another, another, another, , another, and another finally, after all the enegry, screaming, bones twisting and body shifting into the different types - is back to how someone usually is - and nude and unconcious.

As not only did his body shift but also, all the memories coming back as The Doctor went through each face.