When the 10th Doctor meets up with the Master in the timeline that never happened he gets aged many many years with the Master's "Laser" Screwdriver.
How did he do that?
Do lasers affect timelords in some weird way?
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Why the hell all time lords carry screwdrivers?– user931May 27, 2014 at 19:14
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6@SachinShekhar: They don't. In fact, most of them didn't. What's that you say, most of them are dead? ...Guess they should have carried screwdrivers.– JeffMay 27, 2014 at 19:49
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1 Answer
The Master explained this in the episode. He built the technology from the Lazarus Project into his screwdriver, including bidirectionality, so he could age someone as well as de-age them.
Now, for the bigger question, how he fit all that in a handheld-sized package, ... well, "it's bigger on the inside!" is about the only explanation we could guess at.
