Mike Miller was clear about what he needed to do Sunday against the Boston Celtics, even as he remains a bit fuzzy about the events leading to that moment.

Left with a wide-open 3-pointer just before the buzzer in Sunday's' 85-82 loss at TD Garden, the Miami Heat swingman was off the mark.

"All I know is I've got to make the shot," Miller said after an optional team workout Monday at Conseco Fieldhouse in advance of Tuesday's game against the Indiana Pacers. "That's what I'm out there to do."

Miller was so open, he said he rushed the attempt.

"I wasn't expecting to be that open," he said. "It's still my job to make it, no excuses, move on, hopefully have another opportunity to make another one."

There remains a lack of clarity about the events leading to that moment, after being toppled by an aggressive screen by Celtics forward Kevin Garnett in the third quarter.

"It's not why I missed," he said. "I'm a little woozy from it, still. But it is what it is. It's not why I missed.

"He hit me pretty good. It comes with the territory."

The blow came two days after Miller was tested for concussion symptoms following a jolt during Friday's victory over the Detroit Pistons on the first stop of this four-game trip that concludes Wednesday against the Toronto Raptors.