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Two options as far as I'm concerned. Either you get behind the net, off to one side (maybe 8-10 feet off the post), get as low as you can and shoot the shooter. Or you go up the sideline and look back on the keeper. I've found the shooter shots to be sorta blah. Here are a couple of keeper shots:
If there's a way to do it that allows you to get all of the elements (keeper, shooter, players on the half line) into the shot, I haven't figured it out.