that is so weird - I swear that is how the shatter combo works: cast frostbolt, when finished casting, hit icelance and use the elementals frost nova on them - they are frozen, bolt and icelance hits and "combos" like that.
imo, casting lava burst and then applying the shock while the burst is "in flight" should work the same way. if it doesn't, I'd call bug on the forums tbh!
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