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

Context: " Uh-- " His foot catches , his ankle hyperflexed and twinging , and he tips sideways , arms windmilling in empty air as he lurches into the bookcase . " Ow ! " Shelves press hard dents into his arm , Don snickers infuriatingly , and Charlie grumble as he steadies himself . " Ow , dammit .

Answer:

Charlie hurting himself .



What is being described in the scene ?