I actually did this in a Mentor Roulette with the group I joined. A DPS left because they didn't want to do Nidhogg Extreme (and just wanted a fast Mentor roulette, no doubt). Well, I told them not to kick the person and we would wait for them to come back. Sure enough, they came back and disconnected really quickly once they did. We did it two more times before voting to abandon, but we unfortunately did not get any sort of reaction from them.