That's a pretty cool video, but the safest range to stay with dracula's 2nd form is right about where the fireballs bounce. From there they can easily be jumped and he can be whipped in the face, his claw can easily be ducked while you whip away, and with his plasma rain it is easy to walk forward and hop into the middle of it as the last 2 fireballs shoot left and right.
It's also interesting how many small quirks dracula's 2nd form has. For example, after losing half life he longer can be stunned. Or the fact that his claw can just be ducked as long as you are NOT right next to him (it can hit you there ducking).
Depending on where Dracula's 2nd form even spawns, there are actually several ways to take his life down to RIGHT ABOVE half, wait till he goes to spit fireballs then beat on him while jumping them and almost kill him completely with that. And that is WITHOUT holy water or crosses.
But I will admit it take a LOT of save state practicing to catch onto him. This was one of the more well designed secondary dracula fights IMHO.