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Your buddy was the most pathetic one in that second vid, comes up acting all tough because the shot of him sliding half a rail gets ruined, calls the kid a douche bag and then wonders why he gets slapped?
Look here little Joshy, don't you cry now, perhaps he was distracted by the boy standing in front of the camera and decided to stop sliding the rail out of distraction, and the thought of such an unnecessary action slightly enraged him, you have much to learn little youngin', very much indeed.