fan interference?

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A ball is hit into deep left field. The left fielder runs back attempting to catch the ball in the air. The left field fence is a low fence. The left fielder jumps up and stands on the fence. The ball soars higher than him. As he jumps up off of the fence in his attempt to catch the ball, a fan purposelly pushes him uppward or in any way assists him to catch the ball. Interferance?out?Home Run? Whats the call?

My name is Mishone Feigin. I am twelve years old. I just generated this question all by my self. I play PONY basseball in california. I usually play second base (most of the time), short stop, or center field. I have allways been interested in these kinds of interference questions and like any question. Please respond.I would appreciate any coments or questions. Thanks so much!