This can give some hope to DK+rets:

"We’re going to change almost every number in Cataclysm to adjust for everything from single ranks of spells to larger health pools to new combat ratings. With much higher health pools, hopefully burst damage will go back to being a tool and not the only way to win matches. "

Much higher health pools means you probably can't be killed no matter how long one fear lasts. And for sure it won't last long on the person that is being trained, who can at that point use a defensive ability.

This means the first fear could probably be ignored and NOT trinketed, unless they use it when one of my chars are already low on HP.

So if I don't trinket the first fear assuming I can survive through it, then my palies will be all over the place so a second AOE fear is unlikely to happen immediatelly, they will be too spread out. So as soon as first fear is over, I quickly change target and hit interact on all so they get back all together. Of course there's corners to worry about and stuff, but that's the basic idea.