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I believe Trayvon, while initially running, accidentally spilled skittles behind him. Zimmerman, attempting to break off his "pursuit", began sliding all around on the loose candies, causing his handgun to fall out of the holster and onto the ground.

Trayvon, looking over his shoulder, saw the handgun and feared for his life. He threw the Arizona Iced Tea bottle at Zimmerman, striking Zimmerman in the back of the head. Zimmerman, screaming out in pain, fell to the ground, landing face-first on his pistol, causing it to discharge toward Trayvon, the fall breaking Zimmerman's nose.