There is a fine line from bringing the knee up for defensive purposes compared to for offensive purposes. I am also a goalkeeper, and still play in a competitive men's league (minor leagues so-to-speak), so I am aware of what I can and can't do while in goal, but also from an officiating standpoint. Not to mention, if you've been around a while, the players become familiar with your techniques and style of reffing, so they know what they can and can't do when you are on the pitch as the referee. They should also know what you will and won't tolerate from a dissent perspective, too!!
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