Searched fairly extensively for a camera angle that shows what I believe to be Rougned
flooring a guy on the opposing team, thats where the crowd *gasps* late in this clip....but to no avail. Looks like this is the only camera angle available and panned away from that side of the mashup of players just prior to whoever landing that haymaker that results in dude on the ground dazed and massaging his jaw. Looks like Rougned had ventured to that very area though, when the blow was thrown and it does appear he is in his trademark backpedaling deal so serious evidence exists that Rougned laid the lumber.
Rougned just 17 years old in this one, 2011: