I'm pretty sure that is the case. I know I've used Annie's cone to kill someone when it obviously shouldn't have.
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gotta play orianna now
gotta play orianna now

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This is a bug with Cassiopea's Q, Karthus Q, and a lot of AoE abilities.
His AoE has a listed range of 700, but the targeting indicator doesn't match up.
I don't know if it's a bug with specifically AoE's, or if it's JUST a bug with spells like Karthus/Cassio Q that are explosions.