You don't need a 10 second lead... you just need 10 minus however long it takes for it to kill your pet. As soon as it turns to your pet, you start casting. Either 10 seconds pass and your pet isn't dead yet (so you dismiss it with a typed command right before your cast finishes), or it kills your pet before then and you only needed enough of a lead to finish the cast. If it doubles for 200 and hits once per second, that's still enough time to only need about a 1-2 second lead on it under those circumstances.
And all agro the pet had transfers to you on death, so the next summon will be able to BS the crap out of it that much longer before you have to start casting again.
At least, that's the theory...
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