After a rugged, foul-plagued game in which each team lost its top scorer, the officials put their whistles away in the closing seconds. It worked out just fine for North Carolina. It sent North Carolina State into a tizzy. Kendall Marshall banked in a shot with 10.2 seconds remaining and the fourth-ranked Tar Heels came up with a pair of defensive stops to edge their state rival, escaping a wild finish with a 69-67 victory over N.C. State in the semifinals of the Atlantic Coast Conference tournament Saturday.