Nail said:Answer: They are indistinguishable (barring a special circumstance). You can't apriori chose the spell caster from among the possible targets. If you chose a target that is an invalid target for the spell Magic Missile, your spell fails.
If they are indistinguishable, how can Magic Missile target some of them and not the rest? Maybe they are indistinguishable to Magic Missile as well?
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