In the latest chapter, when Monet (in logia form) was taking a bite on Tashigi, she took a cut on her cheek (attack by Zoro). I thought that BH can only be imbued on a solid material (e.g. arrows or bullets) and not able to be imbued on non-solid stuffs like laser beams (from Kizaru) or fire shots (from Ace or Sakazuki) and the same applies to compressed air shots / slashes.
From my understanding, what cuts Monet was a compressed air slash sent by Zoro. If that's true, how could it be imbued with BH? If its not imbued, then how could a (just) compressed air slash hurt an intangible logia?