So did Harrison's hit on the Browns receiver several years back, but I don't know what it is?
That was under some defenseless receiver rule that was not being enforced evenly during its inception or change in enforcement. It also involved sending a message since he was publicly out spoken about it. There was also outside pressure from the concussion lawsuit at the time so Harrison had painted a target on himself and had gotten to the point of being watched by every crew in the league for anything they could drop on him. The league also dropped a rule to protect the defenders from Ward at this time as well since it is unbecoming for a wide out to knock out safeties and linebackers just not done you know.