Rainbow Dash and Rarity had blue gas instead of green

[RarityFan01 2,444]

In the scene where the Rainbooms were fighting, gas went up from them to the stage for the Dazzlings to feed off of. I noticed something, though. While AJ, Pinkie, and Fluttershy had the typical green gas, Rarity and Rainbow's were more blue. Does anyone have any idea what this means? 

[The Awesome One 1,314]

At first I thought they were all blue because the negative energy they were giving was different from everybody else's because they had Equestrian magic in them. However, none of the other one's had blue gas so I thought maybe it was an animation error or something.

 

Or it could be that Rainbow Dash and Rarity's negative energy was much more stronger.

[RarityFan01 2,444]

At first I thought they were all blue because the negative energy they were giving was different from everybody else's because they had Equestrian magic in them. However, none of the other one's had blue gas so I thought maybe it was an animation error or something.

 

Or it could be that Rainbow Dash and Rarity's negative energy was much more stronger.

The latter wouldn't make sense because Rarity was the least problem. Applejack should have had the blue off the latter was the case. She was the one who started the fight which caused the gas.

[Unlikeable Pony 2,698]

I blame the bean burritos they ate.

[Sidral Mundet 1,666]

Probably just a slight color change for better contrast between each character's negative aura.