Brian Hickerson had a blunt response when asked about the death of Hayden Panettiere. The late actress’ on-again, off-again boyfriend was at a gas station in Greenville, South Carolina, Wednesday, when he was asked by a photographer how he’s holding up, in a video obtained by E! News. Hickerson — clad in a yellow t-shirt and wearing a backwards gray baseball cap — responded, “How do you think I’m doing?” The photographer then extended his condolences, to which he replied, “Appreciate it. That’s all I got for you, man.” He had a visible injury by his left eye, presumably from his altercation Saturday at a bar in Greenville with other…