Blizzards & criticals

[Skandranon]

Now in solo, suppose you herded a huge group of mobs (say about 20) then put a Blizzard between you and them I imagine they'd plough right through it. Still even if movement was slowed to 25% with talents it wouldn't take them very long to get to you. Some would get frozen which is nice. Still with Blizzard hitting at best once per second and Frostbite chance to proc 15% it won't stop a crowd
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From what I can tell, the snare is checked only once, at the beginning of the spell, and not again for any succeeding waves. Anything outside the AoE when you cast it will not be snared.