One condition under which it can happen easily is surprise combat. If you start the fight while everyone around is green, the game will automatically include all the greens as hostile.
In other words: You enter, and the Don and Milano are green. You initiate combat, and start right away with making elementals and buffs. The Elementals form before you've done anything to the Don or Milano, so everyone is green. Once you start hitting the Don or Milano, the elementals join them in turning hostile, because they are, after all, monsters, and assume you've turned against alla the greenies.
You gotta do something to make the intended foe turn red before the elementals form, so they can tell the difference.
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