[ He's about to say 'it's a plan' regarding their silly plan regarding the letter, but Varric's words take the wind out of his sails, so to speak, and the words don't seem to really come for a moment. ]

If I seriously participated in something like that and walked free, my Master would no longer have any use for someone like myself, and dissemble me immediately.

[ ... Why yes, that is his way of objecting to it. ]

Besides, who is to say the Wordsmith will honor his words?