By Gary Washburn Globe Staff LOS ANGELES - Nets assistant coach Sam Mitchell was sitting next to rookie Damion James, who has missed the last two months after foot surgery. On the TD Garden's visiting bench, Mitchell began telling Kevin Garnett stories to James, as if Garnett was a legend of generations past, not the starting power forward with the Celtics. ``Kevin never let up in practice,'' Mitchell told him. ``If I came to practice and wasn't at my best, he would embarrass me, make m
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