How I always remember blind working was a way to lock agro once you had it and were in melee range. I often used it as a shaman to tank all the way into PoP. Cast slow, then a DoT and then chain blind for agro lockage. Even a necro doing max DoTs couldn't pull agro unless blind was resisted for a round or two.
However, it only worked to lock agro if you already had agro and were in melee range. If someone else had agro and you blinded it, the mob would lock onto that person. Ideal way to help a tank hold agro if he was having issues. Just force people to wait a tick for him to get agro, then spam blind to make sure he didn't lose it.
If the mob is blind and the person it is latched onto moves out of melee range, it acts as a fear and causes all sorts of havoc. At least that is the way I remember it functioning.
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