Actually it's similar to the Team Deathmatch idea (or cats and mouse) : two teams battle, each team has a runner, and all the other guys have to protect it. The runner who crosses the line first makes his team win.viewtopic.php?f=9&t=928
The difference is that in your mode, there is only one runner. It's interesting, since it would make use of the destroyable feature.
Even the bodyguards/attackers could be destroyed. It would be fun.
Maybe the Priority Target should have means to recover the health - especially if the bodyguards and attackers can catch him quickly