Probably him

"Oh! Wait, Hailey," I shouted, not able to process anything Hailey said as she dragged me behind her, "I might twist my- Ah!" 

Hailey was tugged back by me while I was yanked ahead by her. She turned to see with an irritated expression. She looked at me sitting on one of my legs under me while the other stretched ahead on the stairs. Hailey was too fast. I was bound to lose a step or two and here I was now sitting in the middle of the stairs with a knee I was sure would go black and blue. "What are you, a five-year-old who doesn't even know how to climb downstairs?" Hailey snapped at me. 

"It was your fault," I spoke with obvious irritation. My hand stretched to the railing as I pulled myself up, whimpering a little as my leg was in an awkward position. 

Hailey rolled her eyes, "Cut it, Selene, I wouldn't even pity you if half of your body was cut off." 

"Sure you would love me dead," I scrunched my nose with the pain.