HENDERSON, Nev. — Las Vegas Raiders training camp lacked a bit of energy on Thursday. Maybe it was the day off before, or that the team wasn’t in pads, or the scorching southern Nevada sun sapped their vigor. But it didn’t feel like the fervor that carried through the team’s first six practices under new head coach Klint Kubiak was there. The same could not be said about Friday.Star edge Maxx Crosby and starting quarterback Kirk Cousins got into an altercation as practice neared its conclusion. No punches were thrown, but Cousins got in Crosby’s face, and the pass rusher met the quarterback’s challenge. The two were separated quickly, and the first big quarrel of camp was quelled without any damage done.“That’s training camp,” Kubiak said. “Those are those two leaders of our team going at it. So that is part of camp. Obviously, you fight in the game, you throw a punch, you’re out of the game. So we’ve got to be smart, treat it like a game.”Raiders players trending up, downSam WarrenThe altercation came as the Raiders lined up for a final team period. Crosby, who’d been dominant all day, burst off the line to beat Cousins’ protection. Cousins saw Crosby coming and attempted to get the ball out to rookie receiver Malik Benson on a crossing route. But Crosby got his hand up at Cousins’ release point, tipped it and forced the ball to fall short of the intended target.Crosby stayed off Cousins’ body, complying with team rules against contacting the quarterback, although he did appear to hit the quarterback’s hand. Crosby had been physical with offensive players earlier in the day and during past practices Cousins apparently saw this as an opportunity to stick up for his teammates.Cousins jawed at Crosby before grabbing his collar. A shouting match ensued before coaches and teammates came in to break things up. Cousins and Crosby continued to throw verbal jabs at each other even as they went their separate ways.Tight end Michael Mayer concurred with his head coach that they don’t want to see teammates throwing punches at each other, especially a star player and their quarterback. But he said he liked the attitude it took for Cousins to stand up to Crosby.“That’s our starting quarterback right now and you want him to defend your team,” Mayer said. “You want him to have some edge to him, which he does. He’s always had that, since the first day I met him when he came in here. I don’t want him getting thrown out. I don’t want him getting a flag or anything like that. But you’ve got to be able to defend yourself.”Cousins’ edge was on full display after the scuffle. He’d had one of his poorer practices to that point — he threw two interceptions during team periods, one that Crosby tipped at the line (safety Jeremy Chinn caught it on the back end) and one he floated into the end zone for rookie cornerback Hezekiah Masses to pick off. But Cousins locked in for the two-minute drill. With Crosby relegated to the sidelines, Cousins found tight ends Michael Mayer and Brock Bowers for big gains over the middle. He then connected with Benson on a short crossing route before finding Bowers again near the sidelines. The drive set up a field goal for the offense — a success given the drill’s situation.