Practice first in 4v4 so you have a clue when you get to Tombs.
I don't use [Backfire] that often due to its high casting time but I'd imagine it's freaky awesome as a primary mesmer.
The trick to Backfire is all in the timing. Even with Fast Casting pumped its still a second and a half to cast, and you want it to hit just when the target is about to start spamming spells.
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