Flurry has very short travel time + notice that it does 3 damage ticks, you should use Glacial Spike and then Flurry immediately, so Flurry even if used later will reach its target faster and Glacial Spike will benefit from shatter.
Flurry has very short travel time + notice that it does 3 damage ticks, you should use Glacial Spike and then Flurry immediately, so Flurry even if used later will reach its target faster and Glacial Spike will benefit from shatter.