Briarpaw's Injury

It's been raining for days. I was laying in my nest comfortably. I can hear the rain hitting against the walls of the stone hollow.
My brown pelt fluffs up to keep me warm. My mind is full of happiness, I passed my warriors assessment!
I hear cats yowling. That makes me wake up. I yawn and stretch.
"Come on! Get out of camp!" One cat yowls. What's going on?!
A cat comes in the apprentices den. "Come on Briarpaw! We need to leave the camp!"
I tilt my head, "Why?"
"No time for questions!"
We evacuated the camp. It looked like all of the cats had gotten out, but then a cat called out, "Where's Mousefur?!"
It was Longtail. The pale tabby was blinded and lived in the elder's den with Mousefur. "I can't scent her!" He began to freak out, "I'm going back in!"
"I'll go too!" I meowed. I didn't want the blind cat to get injured...
We go back into camp, Lionblaze and Dovepaw are still in the camp checking the dens. The rain poured harder.
Longtail and I got to the elders den and found Mousefur.
"What are you doing? A tree is about to fall! It could crush you!" Longtail exclaimed.
"I don't want my nest to get wet." Mousefur grunted. She can be a pain sometimes...
"We don't have time for this!" Longtail shouted.
I heard a crack, then a heavy weight fall on me. Then every thing went black.

I wake up in the medicine cat den. Where's Longtail?
"Good, you're alive." Jayfeather sighed.
I tried to stand, but I couldn't move my legs. What happened to me?!