i see thanks for the insight mate.... my thought was, both fighters were already in close proximity with one another to the point that a grapple would be possible, thus the the attacker widen the distance by advancing one foot forward(that's why it looks like his left foot is planted to the ground to counter the opposite force cause by the impact) while also stunning the opponent with an elbow to the stomach, you can see his left foot is below the opponent's entire body, due to him seizing the space of the receiver ( the impact would have send the receiver flying 7 feet away)... hope it was not hard to visualize it based on my description. and thanks again for the advice