WALTHAM, Mass. -- Boston Celtics guard Marcus Smart laughed off comments that Chicago Bulls forward Jimmy Butler made after Game 4 questioning Smart's toughness. After they got into a brief on-court dustup in the first half of Sunday's game, Butler said Smart is "a great actor, acting tough. It's what he does. But I don't think he's about that [life]." Given the opportunity to respond after the Celtics' off-day practice Tuesday, Smart said his toughness has never been questioned and fired back at Butler. "I laugh at that," Smart said. "This is about Celtics vs. Chicago Bulls, not Marcus Smart vs. Jimmy. I ain't gotta sit here and say this and that -- I'm this, I'm that. I ain't that type of guy. My actions speak harder than words. It ain't hard to find me. But right now I'm focused on my teammates and this series." Smart conceded that tensions tend to run high in the postseason, and while he tried to downplay Butler's comments, he clearly didn't...