Yes. People say the Doctor burns through his regenerations too quickly. All the more for the Master. And I don't know that he was ever stable. But he and the Doctor were friends for a long time.
[OOC: There's one great line from Missy that Moffat later cut Clara is challenging Missy that she and the Doctor couldn't be friends because Missy kills people. Missy points out that the Doctor does too. "The difference is I enjoy it more. He's a farmer, I'm a hunter." Which is one of the best descriptions of those two I've ever seen and CURSES to them for removing it!]
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Yes. People say the Doctor burns through his regenerations too quickly. All the more for the Master. And I don't know that he was ever stable. But he and the Doctor were friends for a long time.
[OOC: There's one great line from Missy that Moffat later cut Clara is challenging Missy that she and the Doctor couldn't be friends because Missy kills people. Missy points out that the Doctor does too. "The difference is I enjoy it more. He's a farmer, I'm a hunter." Which is one of the best descriptions of those two I've ever seen and CURSES to them for removing it!]