2nd bonehead move by Cousins in the series. Guy doesn't even know the rules.
Even so, that's on the coach as well... on plays like that you need to make sure your player is aware of those details.
Hoping the same standard is applied to our coach next season 
It's one thing for something to occur in the moment, but you're on a deadball situation and probably getting instructions from the coach on what to do (miss on purpose), you very [dang] well should remind your players of the important details.
Like coaches need to keep reminding players at end of games "NO FOULS", but there's always that bonehead that does it anyways.
That all said, looking at the replay it doesn't seem like he's unaware of the rules like bdm860 said, as soon as the whistle was blown he knew what happened... he wasn't dumbfounded, just "missed".