And on a second look, bodyguard is broken at the basic level. That is because bodyguard is really empathetic dmg spreading, not bodyguarding. As long as TP enemy is out there no amount of this type of 'bodyguarding' is ever going to help me in PvP play.
Here is an idea on how Bodyguard should be. As long as a minion is in supremacy range the MM shouldn't be able to be targeted for direct attacks (though the minions can be). Simple, to the point, no fuss. An actual Bodyguard power.