Those few Kansas City fans who booed Trent Green in the first quarter Thursday were probably ready to beg him to come back in the fourth. Green looked sharp in his first appearance in Arrowhead Stadium since insisting on a trade to Miami during the offseason. The Chiefs, on the other hand, mostly looked lifeless for the second straight week while trying to find a new quarterback and limp along without holdout running back Larry Johnson. In the final minutes, Patrick Cobbs scored a touchdown and John Beck slipped into the end zone for the 2-point conversion that led the Dolphins to an 11-10 victory and made them 2-0 in the preseason for the first time since 1982.