The Doctor watched both Masters regenerate, saw them change, saw them revive - but it all seemed to be coming from a long way away.
A glint of metal on the floor beside him caught his eye and he looked at the gun lying there as if seeing it for the first time.
He swayed for a moment, blanching again. Then cold resolve filled his face and he picked the gun up again, lurched to his feet and staggered across to join Romana, pointing the gun down at the Master.
He didn't say anthing. The bleakness on his face was enough.