What you're seeing is in fact "attack mode". You can't release that fish into the tank so long as that behavior is happening (unless you wish to witness a real attack...).
Oh, I fully understand that part. What I'm asking is, will the wrasse in the breeder-box be okay for several days given the size of the box and the size of the wrasse? (I understand that releasing it into the water is a death-sentence and much worse - I'm asking if I should return her though, not release her in the DT)
I'm not okay "torturing" the wrasse by keeping it in such a small box, but if it's only "uncomfortable/annoying" for the wrasse, I'm okay with that as it's hopefully for a short amount of time.
Hope that's clearer.