Maribelle can only dance for two people at a time, I'm afraid.  Though, if Edmund and Alice both have at least 5 move, he can still move up to finish off the soldier, then the two of them can get a dance and move to attack the boss...<br/><br/>Edit: Or, since Alice has 4 move, Edmund would need to be in melee range of both foes in order for the tactic to work.