Originally Posted by burygnome
Didn't seen anyone mentioning this. Also on Heroic Ragnaros encounter you can knock back Sons of Flame that going to the hammer from lava side simply by using Mana Shield and going into lava for 1 tick. It does help a little and you don't have to waste other class knock backs on longer CD. 
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Furthermore, on Heroic, Incanter's Absorption can reliably be used to knockback your fixated Molten Elemental. This will only work for guilds using a Phase 2 strat that spreads the Elementals out however. Just be sure to stand away from others to guarantee your knockback will go off.
Although using Mana Shield in this fashion is indeed a minor DPS loss, it should not impact the raids ability to get to Phase 3 in a timely fashion. You'll still have 3 sets of Elementals regardless (2 sets for some guilds even).
Molten Elementals base hit for ~15-20k on a 1.2 second swing timer. The knockback should negate a couple melee swings. While this doesn't sound like much, if you run with a comp that doesn't have strong raid CD available for Molten Inferno, and use a spread out strat in phase 2 - the first couple seconds after each Inferno can be a tense period where healers are struggling to top the raid up in time.