The person in question appears to be known Nets fan Jeffrey Vanchiro, who has a penchant for wearing neon and had his leg amputed after a car accident at age 21.
A video posted by jeigs (@jeigs) on Dec 12, 2014 at 6:23pm PST
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It’s also worth pointing out that a movie was being filmed at MSG during the game but it appears that it was not part of the act.
In any case, this is one of the weirder things that has happened in the stands at an NBA game lately.
Source: SB Nation