With 11.2 seconds to play in the fourth quarter of that game, Nelson hit a step-back jumper over Bulls center Joakim Noah to tie the score at 101. As he jogged to the Magic's bench for a 20-second Chicago timeout, Nelson cupped his hands in front of his groin in a celebratory dance Sam Cassell made infamous. SBNation.com has a .gif of the sequence.
Nelson finished the game with 31 points, a season-high total and just one point shy of tying a career-best, to go with 10 assists.
The $15,000 fine is in line with others the league has levied against players performing the same dance move. Milwaukee Bucks forward Caron Butler was the most recent culprit, drawing a fine for that amount on November 6th.