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Sadtryme you're awful. Just don't post anything. Bad rogue you should learn what is sap. And for sure if i sap his casting it SHOULD STOP IMMEDIATELY. Now stop post your stupid posts and be queit scrub. No one care for you. It's a bug !!!
I definitely know how sap works, it should interrupt such things, sadly, Blizzard made it like that: if you sap exactly at the time when the mage casts Blizzard, he will continue casting.