“With a stellar Persuasion check, Tomas carefully explains that he was attempting a non-lethal takedown of the guard, while at the same time using a superb Deception check to explain that the padlock on the cellar door was unlocked when we got there.”
Canonically, though, Tomas Rhymer can’t lie.
I don’t know what you mean, “Honest Tomas” has never told a lie.
EDIT: Technically speaking, when we got there, the padlock was un-locked (as in, made to no longer be locked).