Motion blur in fight scenes?

In an upcoming short I'll be doing there will be one scene where one actor is on the ground and the other actor above him punches him in the face and drops him down(so ends up lying on the floor). For it I was considering using my 50mm 1.8 (longest focal length I have) to try sell the effect. Considering shooting it close to over the shoulder from the victim's side. However wondering should I have a slower shutter speed? 1/30 or 1/50? Like to hear other people's opinions on the matter, just though of it there. Wondering would it sell the effect more
 
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