You do know that not only are you talking bullshit but the manga chapter itself disagrees with you right? Let's break it down cuz people be capping alot
Koby makes it clear to her that he doesn't want this to drag out unnecessarily because he sees no reason to cause destruction.
Boas sister response to him is that he is to conceited and that they will handle him.
Boa on the other hand decides to fight koby and the marines herself not allowing her sisters to do so. While her sisters called koby conceited, Boa on the other hand took koby seriously to the point that she engaged him and the group of marines herself.
Now let's further address your bullshit. After she turned the entire grouping of marines all except koby into stone she then goes to attack koby with her strongest physical attack to date "The Perfume Femur". There are only two attacks in boas entire arsenal that begins with the word "Perfume". Coicendentally enough while she was prepping to attack koby with it he was ordering the seraphim to cease fire as to not destroy his comrades already turned to stone. So not only was Boa going to attack koby with her strongest physical named attack WHILE HE WAS DISTRACTED but her trying to attack koby allowed blackbeard to jump her
Her only attacks that start with the word Perfume are:
And