Well, you basically have a few options. You can block low, block high, try to jump out, throw, or attack. If I go for any kind of mixup, your 4B will hit, but so will any other move. I just had to make sure you would block first.
Jumping out is the hardest thing to stop for Hakumen usually. Hakumen oki has always been terrible compared to everybody else though. It got better over the last few games, but still.
Also you changed your title. :P