The League Two side were 2-1 down at Home Park on Tuesday night, before Kelly’s frustration got the better of him.
Tempers were boiling over with Orient winless in their previous eight games, including a six-match losing streak.
In the 86th minute, as the ball boy came out to collect a loose ball and return it for a corner, the midfielder pushed him to the floor using both hands. Bizarrely unnecessary.
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