5 Monks in 5 Karazhan's at Once

Still trying to get my hands on the Fiery Warhorse's Reins. Just about the whole time I've been subbed and playing WoW, since BC, I've tried to get this mount.
Numerous runs when it was current content, numerous solo runs at 80 and now back in there at 90.

So I'm only killing the 1st boss and thought for fun I'd try running all the Monks in separate instances at one time using broadcasting... It sort of works