By Lauren R. Giannini       Photos by Stephen Thurston, www.stephenthurstonphotography.com Sue Blackmore is an accomplished rider who for nearly 20 years has served as whipper-in (field assistant) to her husband, Martyn Blackmore, huntsman since 2014 for the Lowcountry Hunt in Jacksonboro, South Carolina. Sue’s primary hunt horse, Dustin, proved he was equally good therapy after