Cenotes boss OP, WTH? Also BUG in weapon swapping

I thought I was facing Alucard. That invisible blade was slicing the heck out of me. Can't be seen, can't be dodged.

ALSO, I have problem switching to secondary weapon set from time to time. The step to reproduce is to jump into Abyss and hop on bird. Walking around and I can't fire skills bound to secondary weapon set. To fix it, I have to get off the bird, fire with weapon set two, then back on.

This happened in the Cenotes boss fight. And I was like a sitting duck. Can't use secondary weapon. Boss flies = game over.

For what it is worth, I have one weapon bound to both weapon set 1 and 2.