Robin: Yay! I get to be the first girl trounced by snow meow Netra! Go me!...er, I mean...Leggo! Grr, when I get out this I'll...wait, I probably can't enunciate right now, can I?...uh...GAAAAKK! URRRRK!
Wow, even if I wasn't biased by the fact that Robin's in it, this is very well done! Good job displaying the exertion and the action of the two of them. And I'm getting a kick out of that expression on Netra's face as she's making Robin struggle. And even if you're not a fan of Robin, you did an excellent job drawing her.
As for why, well, they're standing in the ring together, what other reason would Netra need?