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In the Doctor Who episode "The Time of the Doctor", the town of Christmas is attacked by a wooden Cyberman.

How did the Doctor defeat it?

We see the Doctor use his Sonic Screwdriver then inform the Cyberman that he'd reversed his flamethrower. He then challenges the attacker to confirm it as the truth field already ensures he's not lying.

The Cyberman is promptly defeated leaving the Doctor to comment: "It doesn't work on wood."

If the Screwdriver doesn't work on wood (as we've seen before) how did he defeat the Cyberman? If it does how did he lie about it?

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He didn't lie, he did send a signal towards the cyberman saying 'reverse your flamethrower', which didn't actually do anything because the cyberman was made of wood; but the cyberman didn't know it didn't work so he reversed it thinking he was undoing the first reverse. – Pharap May 28 '14 at 5:43
up vote 6 down vote accepted

He set his Sonic Screwdriver to reverse the flamethrower. The Cyberman confirmed that the Sonic Screwdriver was indeed sending that signal. It is because it doesn't work on wood that the flamethrower was not actually reversed, the Cyberman just thought it was. The Cyberman did not know the Sonic Screwdriver doesn't work on wood.

Rule 1: The Doctor lies. Apparently, even when telling the truth.

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I'm afraid I don't follow - it was reversed, it blew a hole straight through him! – Liath Jan 2 '14 at 13:51
The Cyberman physically reversed his flamethrower after he thought its polarity was reversed. He reversed it thinking he would be firing forwards. – Meat Trademark Jan 2 '14 at 14:03
Ok, so the Doctor truthfully sent a signal to reverse the flamethrower's direction. He then told the cyberman that that's what he'd done(but left out the fact it wouldn't work as he's made of wood), so the cyberman turned it around, however as it hadn't worked he shot himself... – Liath Jan 2 '14 at 14:06
Yes. He truthfully sent the signal, he just didn't mention it didn't work. – Meat Trademark Jan 2 '14 at 14:08

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