The Los Angeles Lakers, shattered by the death of franchise icon Kobe Bryant, are trying to wrench their attention back to their pursuit of an NBA title, a chase that resumes Friday against the Portland Trail Blazers. "We're concentrating on the work," head coach Frank Vogel told reporters at the team's practice facility in suburban El Segundo. Before getting down to the most serious work, however, the Lakers warmed up outside with a little soccer and American football designed to lighten the atmosphere.