I may be wrong but as Annesley described it, Best has been dispossessed of the ball in the action of Harper's tackle (not a strip), and the ball has then come in contact with the Manly player before Best regathers it.
Dash - broncoshq.com JOINED: .December 12, 2014
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If we're getting really technical, how can Best knock it on into Harper's arm when Harper's arm is behind Best's arm?
I assume that he has lost it forward because at the moment he loses it both he (Best) and the ball are moving forward, regardless of Harper's arm being behind the ball.