Boggle is a Jolt. It's fast cast and meant to get you back off the top of the Hate List (just like a Ranger's Jolt). I do not really know if you Mezed a mob, then cast enough Boggles to get your Hate "negative" if it removes you completely.
Mezes also include a Mem Blur chance:
Quote:
Euphoria
Slot Description
1: Mesmerize(2/73)
2: Memblur(30%)
To repeat what someone else said, casting a Mem Blur on a MOB that is engaged is generally a "bad thing". It completely wipes the Hate List. It will attack the closest player.. and any action, like a Heal, will grab the mobs complete attention.
If a MOB you are fighting attacks you, this is when you should be using Boggle.. to reduce the MOB's hate at you, without clearing everyone else's Hate (like the tank).
You use Mem Blur when you want a MOB to forget everything. There is a Gates AA "Enhanced Forgetfulness" which increases your chance of successfully a Mem Blur (both the built in chance from Mez and Mem Blur spells).
With a tank that knows how to properly wake mobs, I generally do not have a Mem Blur memmed.. but I always have Boggle up.