Weeelll since they're both running about Redcliffe now, their meeting will likely come sooner rather than later! Talfryn's old-fashioned and he believes in the Chantry enough to be wary of apostates, but to be honest, it's really not his business to lock them up. And provided Brennan falls under the protection of the Grey Wardens, Talfryn is in absolutely no position to counter their authority. He also respects Miss Imenry enough, in spite of their cultural differences, not to be unkind to her friends and allies, so you won't see any animosity from him. Just...caution.