Some of the most gripping action came right at the end of the Hall County track and field championships. The Riverside Military Academy boys clinched their first county championship with a strong second place finish in the 400-meter relay — the final team meet of the night on Thursday in Flowery Branch. About the same time, Gainesville’s Hunter Mallard, ranked the top pole vaulter in Class AAAAA, twice set a personal best while claiming victory (14-feet, 8-inches) in a battle to the finish against North Hall’s Gil Hoffman.