The Silurians in Cold Blood and The Hungry Earth used their tongues as weapons, of sorts, and caused a man to begin to mutate. Vastra seems to appear similar to them, however, she doesn't seem to show any inclination towards that sort of fighting. Instead, she usually uses a sword.

Is there any evidence proving that Vastra can use her tongue as a weapon, and if so, why doesn't she?

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    A tongue is personal and maybe she isn't wanting to go around licking every person she has to fight. In the instances I have seen her use it, it was because it was expedient, nothing more. I think she wants to NOT appear too different from her Human lover. – Thaddeus Howze Aug 27 '15 at 19:41
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    Jenny is a lucky girl – user46509 Aug 28 '15 at 21:42

Yes, in her very first appearance in "A Good Man Goes to War", Madame Vastra uses her tongue to disable an enemy soldier:


Vastra: Was I being insensitive again, dear? I don't know why you put up with me.

(She turns and lashes Lucas with her extendible tongue.)

Doctor Who Series 6 Episode 7: "A Good Man Goes to War"

As to why she doesn't use her tongue more often, we don't have an in-universe explanation1. One reasonable possibility is that it becomes very obvious that she doesn't fit in; in "Deep Breath", we learn that this is rather important to her:

Vastra: I wear a veil as [The Doctor] wore a face for the same reason.

Clara: What reason?

Vastra: The oldest reason there is for anything. To be accepted.

Doctor Who Series 8 Episode 1: "Deep Breath"

1 Out-of-universe, Moffat probably doesn't want to waste budget on the CGI when the sword serves perfectly well

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    Actually I answered first, but he addressed both questions, and I only got the first one, so he deserves the point :) – gowenfawr Aug 27 '15 at 20:07
  • IIRC, the venom shot could only be used once every so often as the venom sac needed replenishing. Alaya only used it once(?) in Hungry Earth/Cold Blood - you'd expect her to use it more if she could. – VBartilucci Jul 27 '18 at 20:07

Yes - she does so around 20:57 of S06E07 A Good Man Goes to War. She and Jenny are in a control room of Demon's Run when a tied-up baddie tries to reach the alarm.

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