Loose Cannon

Loose Cannonas tony soprano's hair-trigger kinsman, michael imperioli helps hbo's blockbuster bad guys outgun the competitionHe felt like he'd been shot. Standing on the sidewalk near his apartment in lower Manhattan, six blocks from the burning north tower of the World Trade Center, Michael Imperioli thought he was a witness to a gruesome accident. Then came a deep bass note as a ball of fire shot out of the south tower, so close he could feel the boom in his gut. ''That's when I Knew--we all k...