The Command effect has always been problematic, but each revision has dialed it down to something more reasonable. The newest iteration has been renamed Rebel and acts a bit like a supped up Frenzy, forcing the character to attack allies only and giving them full use of their abilities.
Rebel
The action forces the affected character to attack allies to the best of his or her ability. The effect does not end if an enemy attacks the character, but that enemy becomes a valid target for the character.
This addresses the main problem with the old version, which forced the affected character to follow the user around. Without an opportunity to break free, the ability effectively had no time limit. This way, the person still attacks their allies and uses all of their abilities, but they can freely rest the effect off afterward.
Just like Frenzy, it will last as long as the person affected is conscious and has targets to attack. Once they don't, they can spend a minute rallying or resting it off.
If a monster is Rebelling, it works the same way. The effect won't end, but the PC becomes a legitimate target at that point.
can this still be used on more then one monster? what happens if another player attackes the "rebeled" monster?