Earthen Missiles is a projectile, even if they look instant they are not
[tome] joylove: You can't just release an expansion like one would release a Kraken XD
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[tome] phantomfrettchen: your ability not to tease anyone is simply stunning
Of course it doesn't matter because there's no oddity at all and it's literally the order in which things occured, just that the guard took a turn in the first tenth of a turn before your missiles reached him.
Oddity comes from all the damage stuff being displayed after the missiles started hitting, really -- those were arcane combat cast earthen missiles, proccing from the dissolve hits, if that wasn't sufficiently clear. A good chunk of it was from dissolve, which doesn't have a delay insofar as I'm aware, and the dual strike from the elf came after the dissolve (and a chunk of the damage should have popped up) but before the missiles actually hit. It would make more sense, continuity wise, if the damage from dissolve et al had displayed, the elf got its turn, and then the missile damage summary occurred. The damage was split up enough the elf had a chance to act, but was displayed as if it all came in one go. Hence the confusion. It looked like the elf had somehow slipped an attack in between dissolve starting and finishing.