I understand the GCD isn't 1 second, I'll add a tilde for you next time to show the discrepancy. My point was that it was marginal trade-off in the OP's position.
I think you're missing my point entirely. I'm not arguing that the lightning bolt wouldn't do more damage. Yes, lightning bolt would do more damage, you're right, yes, I understand that. I'm saying the extra damage on the lava burst, in a setting where you're playing 4-5 elemental shamans, and thus hitting somebody with 4-5 lava bursts, the 30% extra damage on all of those is the difference between somebody dying and living, and the time between your lava burst hitting somebody and the subsequent lightning bolt hitting them is plenty of reaction time to prevent their death.
Having one less person to worry about in the fray is a lot more beneficial (in my opinion, I stress, opinion) than a stack of lightning shield that you're likely to lose (Like I said, 4.2, I'd be singing a different tune.), the possible chance for extra mana or the extra damage on the chart instead of a killing blow. It's not a 1:1 trade-off in benefit, nor is PvP as clear cut as PvE in terms of what you should be casting when.
You can throw numbers all you want, however, that doesn't mean you are right though.

You're welcome to your opinion just as I am welcome to mine, PvP is extremely situational, and I'm sure you're right in some situatons, and I'm sure I'm right in others.
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