Bruh, I didn't know you couldn't get knocked down if you crouched (and I already beat the game). Thnx, gonna try this because I was losing my mind (I was able to go through this section, but the boss duo after screwed me so I had to retry the level...).
Edit; I could finally beat the 1st stage, thnx dude (also beat the unicorn and warrior duo). Managed to beat the 2nd stage as well (the 2nd duo is more annoying though; the swordswoman is tankier than I expected, and the giant "spider-woman" thing can complicate things), but then, because I had low health, I got screwed in the 3rd stage; in the small room with the harpy, ghost and snow girl (seriously, this entire dungeon is a big middle finger from the dev...).
Gonna try again later, so far, I hate this place and I doubt I'll enjoy it (I just hope I don't have to fight the final boss *and* another one at the same time, I'd quit).