Once Sierra saw who it was, she felt absolute hatred well up inside. She knew them to be the most caring person.
It was one of the schools medics, and they were the one that was most often jumping to help anyone they could at any time.
They were a mutant as well, and she knew that, it was how they were so effective with the medical stuff. The question though, was why they were doing this.
But Sierra wasn't going to dwell on that.
Without considering that they would likely have some sort of protection against her, she just raced toward them and stepped inside their body, intending to kill them from the inside out.