I often draw parallels to my experience playing D when looking at our defencemen, which I know is ridiculous because I couldn't even hold their jocks (in probably better than Stanley, though
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What I see with Pionk (and some of our other D) is if they're not moving their feet, they get into trouble like forcing themselves into an unnecessary board battle, blindly throwing the puck up the boards to a waiting opponent, or icing the puck out of panic.
When I'm not feeling sharp or confident, it immediately goes to my legs and feet. I start standing around and moving in a reactionary way instead of being proactive.
When you're in motion, or take a few strides with the puck, it opens so much up for you, such as turnbacks and deceptive pivots. Additionally, it forces the forechecker to try and anticipate what you'll do, which backs them off a bit, giving you space. Finally, when you're in motion, it's fast easier to change the passing angle which opens up a ton of options for you.
When you're standing still, you severely limit your options.
When I'm feeling this way, I'll be telling myself over and over to move my feet. Sometimes it works, but sometimes I just can't convince myself.
It really is a fascinating human element to the game.