"Well, I hadn't absorbed a large quantity of nuclear energy before my other regenerations." He cleared his throat. "I would never hurt her! How could you even think that. Either of you? I'm still me."
He frowned and turned his back so he could emote for a few seconds without being spotted. They both knew him too well. The Doctor rolled up his sleeves, right arm and then second.
"I tried to take a five minute jaunt into the future to recalibrate and ended up here instead. Caught up with River and then the two of you."
The Doctor scratched his head. He still wasn't used to the length of it. That much was obvious.