The thing about gunshot wounds is they don't hurt as bad as you'd think. Must have something to do with adrenaline. Really, Sam didn't even realize he'd been hit until he saw all the blood gushing. "Dad…" Sam said, trying to keep his voice steady. It didn't hurt so it couldn't be that bad, right? Still, he felt woozy. His knees went weak and he feel to the ground. Dean was at his side in an instant, cradling his body. "Dad!" Dean screamed. Everything went fuzzy. All Sam could think was, huh, so that's how it feels to get shot.
