Phil Mushnick lives in fear...of flying t-shirts. In his New York Post column, sportswriter Mushnick suggests that Sly Fox, the Nets mascot, is endangering us all by firing air cannons loaded with rolled t-shirts into the crowd at Continental Airlines Arena. The frenzy that follows is Phil's real concern. "Mark my words," he intones. "Trouble's coming, big-league trouble. It's a lock. And it'll cost someone their health and a team millions in legal and settlement fees." Be afraid, be very afraid. Others disagree.