The Doctor was shaking with rage as he felt the Master getting nearer, as they sucked him down through the building towards them. His lip was curled in a snarl and his hands were locked tightly around those holding them.
He caught the edge of Jack's thought about his gun and managed to ease up on the hold a little, wishing he had a weapon of his own to reach for. One that was more useful than a sonic screwdriver, anyway.
Part of the remaining floor above them began to bulge and he drew himself together as best he could. Trying to stem his rage and find the calm he knew he needed.