LightClan
First, if you are going to write from two different views, make sure that there is a purpose behind it. Giving different points of views, being in different places, ect. Right now, this whole thing could be written from either one of their point of views and it wouldn't lose anything. Also, try to put like a good size chunk between switched. Like minimum 5 paragraphs. Otherwise it can get really choppy.
Also, I feel like we need more background on this clan, and maybe a little more about lightclan? It seem unlikely that the leader would just be like "Sure, have fun! Hope you succeed." being that he would be taking horses from his clan and all. And give use a who, what, when, where, and why. We got the who and what, but where is this new clan going to be? Far far away? Or just over the hill? Is it decided yet? When is it happened? Soon? Tomorrow? A week? A month? a year? And why. Why now. Why separate. What brought it one, why tell the leader, ect.
Making sure that you know and show all this elements will help you move forward, and help round out your character later as it gives them stuff to react and eventually grow with.
I think the writing it self it good. I didn't see any grammar or spelling errors. There was a fairly good mix of dialogue vs action, and it seemed to be moving at a decent pace! I would love to see what you do with it!