Based on the context and the answer, generate a question. 

Context: She knelt down just infront of him , a hand grabbing the top of his helmet as she tried to study his eyes , wondering why he was n't able to see . " Hold still . " She snorted angerly , annoyed . " And do n't worry about me , I ' m fine .

Answer:

He may have crashed his bike .



What may have happened before he was unable to see ?