The game is always a little more dangerous, for better or worse, when Mario Chalmers is on the floor.

The Heat has learned to live with that, and it's working out well. Because for all the unpredictability Chalmers brings to the basketball court, his best stuff can be pretty terrific.

It's why Chalmers always has seemed well worth Miami's risk, and too often a convenient target when things go badly.

"Just something that happens," he said Thursday at practice. "You can't let it mess with you."

If it sometimes seems as though the Heat leaves Chalmers out in the cold, well, he is from Alaska.

Chalmers was the Heat's starting point guard as a rookie in 2008-09 - for every game of the regular season and the playoffs, by the way - and then he wasn't last season. This season has been a merry-go-round with Chalmers starting, then not starting in favor of Carlos Arroyo (now with Boston), then starting again and then back to not starting when Mike Bibby fell into Miami's lap.

"You have to be professional," Chalmers said.

He's working on the right-place, right-time thing in terms of meetings and general behavior, but sure had it nailed Tuesday night in Game 2 of the playoff series against Boston.

The clock had ticked under seven minutes in the fourth quarter, and the Heat - having outplayed the Celtics - nevertheless was locked in an 80-80 tie.

That's when Dwyane Wade drove toward the basket, spotted Chalmers behind the three-point line and delivered him the ball.

Chalmers rammed in the triple - his only field goal of the game - and off went Miami on a 14-0 run that led to a 101-92 win and a two-love lead in the conference semifinals.

One superstar had assisted on the play, and another, LeBron James, provided congratulations.