MLP *500 sub special* Rainbow Dash & Lightning Dust ~Somepony that I used to know

Song by Gotye Sooo, did anypony else catch on dad Lightning Dust got her dreams destroyed by her own mentor? I wanted to do something about these 2. Story line goes that after becoming Wonderbolt captain, Rainbow Dash is to train the newbies on the Academy. But there is a mare that awfully reminds her of a somepony that she used to know. She digs deeper and learns that after being expelled from the Academy, Lightning Dust got caught in some bad crowd, and ended up in the Shadowbolts *I believe that they are a real team Nightmare Moon copied on*. All of this makes Rainbow Dash ask Spitfire, "Did we do the right thing?" Tell me what ya think down in the comments: DID they do the right thing? Also, OMG I AM FREAKING OUT OMG SWEEEET CELESTIA, MOTHER OF ALL PONIES, 500 SUBS!!!!!! I LOVE YOU ALL SOOOO MUCH!!!!