Ah, the perennial problem.
Is Sam new to group rides? If so, I wouldn't hesitate to speak with him and/or point him in the direction of websites with some general etiquette guidelines.
Is there a designated ride leader? If so, speak to them and ask them to speak to Sam.
If neither of the above... when I'm in that situation, I just make sure that the next time the paceline breaks for a busy road crossing or whatever, when it re-forms, I'm not behind that guy. (Also that I'm not in front of him [why is it always a him], because those are the same people who jump when they get to the point, meaning I'd have to bust my *ss to get to the back of the paceline after my pull is over and wouldn't get a chance to rest.)



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], because those are the same people who jump when they get to the point, meaning I'd have to bust my *ss to get to the back of the paceline after my pull is over and wouldn't get a chance to rest.)

