I was thinking purely hypothetically, as I have never done this, if it would be possible to "mister bill" off a tandem. What I would "imagine" is that the "student" would wear the tandem harness under his own rig, and the tandem would exit, get stable, deploy the drogue, deploy the canopy, and then the "student" would be released from the tandem into freefall again. This is different than the standard mister bill as the pair would actually freefall together before a terminal opening as opposed to the sub-terminal opening used in a standard mister bill.
I also "imagine" that to do this the "student" would have to be face to face with the jumpmaster because otherwise the bulk of his rig would interfere with tandem hookup.
I'm wondering if anyone has done this or know's if it's been done. Also, are there any SPECIFIC regulaions against this, either by USPA or the tandem gear manufacturer (assuming that the pair was jumping the latest most popular tandem gear available).
Either way, don't anyone get any ideas to go off and do this, it is very dangerous and scary, and could really freak people out on the ground to see a body fall away from an open tandem, especially the DZ management, and they might get really really mad.