Rachel's powers include telepathy and telekinesis. In her own time, people used her psychic abilities to find other mutants. She was made into a Hound, forced to help hunt her o…

Rachel's powers include telepathy and telekinesis. In her own time, people used her psychic abilities to find other mutants. She was made into a Hound, forced to help hunt her own people. The facial markings are connected to that past. So are the fear and guilt that keep coming back when she tries to move on. She knows what she was used to do, and knowing she was controlled doesn't make the memories disappear. That helps explain why she's so quick to react when she sees signs of the same future happening again. Registration, anti-mutant hatred and people treating mutants as something to be contained have consequences she has lived through. The other X-Men can argue about what might happen. Rachel remembers it happening. That doesn't make every decision she makes a good one, but it explains why asking her to calm down and wait can be a lot more difficult than it sounds.