One of the hypospray vials rolls to a stop against the Doctor's hand. He picks it up, glancing at it and then watching the Master fumbling to collect them. This is all rather excessive for the man who thinks he's practically invincible, the Doctor raising an eyebrow, the attack almost forgotten.

Keyword is almost.

"Missing something?" the Doctor asks archly. He holds up the vial and sniffs it. The Master's scent is all over it. Lovely. Judging by the way he's scrabbling around as if he's a human with gold, it's clearly valuable to him.