Hecarim laughs at your wards while he runs straight down the lane to kill you. Zac just jumps over the tower to the middle of the lane. Volibear isn't nearly as bad gank wise, but he does have the trolololol towerdive passive, so I guess this was an okay spot to hit. Hecarim has to back off a bit from tower dives since they nerfed his W and Zac doesn't have a fling.