@Cosmas-the-Explorer
Not only was the first part brief, Rainbow Dash was trying to organize the entire Ponyville Pegasi for the event, so its more then understandable that RD couldn’t give full emotional support to Fluttershy right away.
Its completely understandable.
RD, despite her daredevil attitude, has always been the most military focused when given real responsibility.
Two classic examples is one from the theatrical movie and one from the comics.
In the movie Tempest works really fast to achieve victory quickly by freezing all 4 princesses without much monologueing. (Villain Lackey of the Year material, one of the most competent villains despite reforming) Despite this, RD thinks really fast and tactically uses her super speed to get Twilight away so it hits the wrong target without the enemy noticing for a couple seconds.
In the Mirrorverse comics, the Mane 6 in the opposite world eventually come face to face with Evil Celestia and Evil Luna. Naturally, Evil Celestia starts monologueing, but RD isn’t even interested, and just decides to assassinate Evil Celestia cause she knows how powerful Celestia is and how dangerous an evil one is.
She flies off in a large arc behind the 2 evil princesses while Rarity looks on, silently catching on with what RD is up to. While the other 4 of the Mane 6 get quickly overtaken and Twilight almost gets flung into a mountain by Evil Celestia, Rarity tries to distract the princesses with a silly insult while RD collides with Evil Celestia’s neck at supersonic speed. Good Sombra notes that RD will kill Celestia if the charging RD lands another blow on the same place, and stops RD because Good and Evil Celestia’s life force is too linked at the time.