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					Originally Posted by Reffing Rev.  The wording of the rule states: a "potential blocker", not an actual blocker, not trying to be a blocker, but a "potential blocker." (I wish I had a rule book here)  
 When does the receiver stop being a potential blocker? When he is head and shoulders even or past the defender.
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 Routes are not always run while running by someone. You can run a route in front of a defender. So if the receiver is not running at the defender, I do not consider them to be much of a blocker anymore. So using that standard of being head and shoulders past a defender is not going to work when you are running a curl route or even a slant. You need a little more to that philosophy to know when to make that call. I see linebackers just hit a receiver that is in front of them and running away from them, but they hit them anyway and coaches think that is the case and get upset when you throw a flag. Usually these are a "talk to" and they are most often not that egregious, but still could be a foul under the right circumstance. 
Peace