*****UPDATE***** I FOUND THE VIDEO WITH THE ACTUAL FIGHT AND MILEY RECORDING IT! 

Oh Miley... The more I watch you, the more I see we are so much alike! I'd totally pull my phone out to catch a catfight too! Who cares if you're in the middle of performing for an entire arena full of people or not?! You see something good, pull out that phone and RECORD IT!!! #Butfirstletmetakeaselfie

So there WAS two videos with the original fight happening at the concert and the second video is the one Miley actually caught on her phone and posted. Now the original video of the fight has either been deleted and the girl who caught it made her instagram private... I'm assuming she got a ton of backlash from Miley fans. Enjoy the one Miley got though...  Only in the D!