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1. This is very tough. Unless it's egregious, I'd leave it alone. If needed step in and take the call before the L (especially if you know what he has and you have something earlier). otherwise just go to him and discuss it. This might (depending on the rules set) lead to a double foul.
2. It's "cool." Not allowed in some areas / mechanics sets.
3. Yes.
4. He had a good look -- I'm sure he will be able to explain it to you when he's over here.
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