I agree completely with Rat5.
I think (in general) that the guy who's signature is in the tech log should land the aeroplane in events such as these. I could be convinced to change my mind if I really believed I had good reason to let the other guy fly. For example if he was experienced and I was a brand new DECaptain on type.
I only flew as a co-pilot in an airline with a very long time to Command, and would have been amazed if the Captain had deferred to me in such a situation.
There is such a thing as lack of confidence even among Captains, as hard as it is for some here to accept.