EXCLUSIVE: Syfy dropped a trailer that gave us the first look at the third season of Van Helsing during their panel at Comic-Con — and it was filled with blood, action and a lot of vampire bodies hitting the floor. Marking its third year at the confab, stars Kelly Overton (True Blood), Jonathan Scarfe (Hell on Wheels), Vincent Gale (Bates Motel), Aleks Paunovic (Continuum), Rukiya Bernard (The Cabin in the Woods), Jennifer Cheon (The 100) and Trezzo Mahoro (iZombie)…