Just to add my two cents as someone who doesn't play masterminds, but does play illusion. Phantasm has exactly 5 powers: Resistance and Fly which are not relevant, Power Bolt a 70ft single target attack, Energy Torrent a 40ft cone attack, and DecoyPhantasm a 60ft summon "attack". There is no melee at all. Just messing around with testing right now, a freshly summoned Phantasm summoned his decoy, used Power Bolt and then ran into melee before using Energy Torrent. He didn't wait until he had no powers to use. In fact, it doesn't seem like he cares what part of his attack chain he is in and just randomly decides to run closer. The decoy acts the same way, though it's harder to see since he gets summoned in melee and it really doesn't matter where he is.