Who said he failed to get her df?
Youre a BB fan right?
I am once again telling you that BB took no Ls this chapter.
Whether you believe me or not, it's upto you.
Why is that surprising lol?
Vasco Shot & Devon are not M3 or Jinbe fights, they are the fights for Mid Trio or even weaker - meaning they are the equivalent of Tobi Roppo in BBP, and they're a bit stronger than Tobi Roppo so as to provide their opponents a challenge.
So why are you expecting too much out of them?
And this is what happens when >~ F6 tier characters fight Shichibukai.
What Boa did was absolutely expected of her.