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The "costumed culprit" allegedly "clambered aboard the float" on which Chi'en was riding and fired Chi'en down to the street face-first. The clown then scurried away into the night, while Chi'en suffered serious facial injuries. "It was a free-for-all," said Chi'en.
The deranged clown apparently made good on his getaway, as cops have yet to make any arrests in the demented caper. There are also reportedly calls for the city to start posting cops on parade floats to prevent another evil clown from ever doing something like this again.
http://www.nydailynews.com/news/ny_crime/2010/11/04/2010-11-04_hween_parade_nut_fractures_reporters_face.html
http://www.youtube.com/watch?v=XE0CAFySImQ&feature=related