I do that often. I told one group they were slower than evolution.Good example. I play golf as well (not as well as I play pool) and have a friend who gets very irritated at slow golfers. He will drive the cart over to the offending group and have no qualms about letting his angst be known.
We have a Let faster players through sticker on each cart.
I often point to the sign and ask which part of the message they don't understand. Is English not your native tongue?
As you can tell I don't give a shit. As for no Marshalls, I call the pro shop and raise hell if one group of idiots is holding up play.
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