Who said that?

[Narkalui]

I just looked it up, and in the absence of @Ghost of Harrenhal I'll act as de facto quiz master (if there's no objection...).

The speaker is not Shagwell.

edited to avoid embarrassment for a schoolboy error

 

[Ghost of Harrenhal]

That's right, it isn't Shagwell

 

[Mister_Oy]

I think it was Tyrion

 

[Ghost of Harrenhal]

Correct!