She watched in bemusement as she seemed to hop around Kat, allowing her to create the staff though not expecting her to be so brazen as to hit her around the head. Whenever she was on Earth she always had to be careful, walking on eggshells, don't go to far or you might snap someone in half; she needed a release, some small burst of energy to break the cycle. And unfortunately for Katherin the staff was really not the weapon to use against Kat.
Shaking out any ice that clung to her hair she suddenly leapt into action, spinning the spear around her, stepping forward in attack and holding it steady to block. They were all more or less a distraction, a delay, waiting for the perfect moment to duck down, trapping one of her legs between Kats body and the spear and rolling - being careful to make sure she didn't hit the floor too hard - but landing Katherin on her back none the less.
"You're not to blame, I've been playing with these for as long as I can remember." She said, releasing her leg and taking a breath of the cool air despite herself. Standing up and sending away her spear, she gave Katherin a hand up as well, before saying "I appreciate the ice." She then walked back into the significantly warmer class room to where she had been siting before, pulling her hair over her shoulder. Her eyes darted to the clock and she put her head in her hands, trying to figure out where in the world it would be acceptable to be drinking right now.
(Sorry for auto-hit but I am so tired and everything is a little fuzzy, I really need to sleep, night!!)