KINGSPORT — Have mercy, please. Dobyns-Bennett and Science Hill left little doubt of their intentions in Tuesday’s District 1-AAA boys soccer semifinals at Indian Highland Park. Both the Indians and Hilltoppers mercy-ruled their opponents to advance to Thursday’s 6 p.m. championship match, also at D-B. The Tribe (17-1-1) exploded for seven second-half goals to oust David Crockett 9-0 in the 68th minute of play.