By Nate Weitzer @nweitzer7 MEDFIELD – Tri-Valley League rivals No. 5 Medfield and No. 19 Dover-Sherborn have dominated their respective divisions over the past several seasons and often play thrilling, close games during the regular season. On a rainy Tuesday night at Calvin George Fisher Field, the two lacrosse powers seemed destined for another photo finish after being tied at 4-4 at the half. It would be all Medfield in the second half, however, as star midfielder Jack Cahill and the Warrior's offense caught fire and pulled away, to earn a 14-8 victory. “The ball was moving and everyone helped each other out by making one more pass to get those easy goals,” said Cahill.