What enemies are casual filters in dmc5?

I've been doing exactly that and never getting hit, then again I'm dancing around it so I'm behind it or to the side of it and just keep going disrupting it. The one's fucking with me are the big twin blade wielders since they don't always stagger or they hit me from behind since I focused on a different enemy. They've never killed me but I've taken a couple hits. Scissors are easy though.

for some reason Vergil goes from normal to DMD in the middle of the fucking fight, the damage is insane sometimes

They only resist stagger for a single attack immediately after being knocked down.

Well the devs planned it to be hard. There is even an achievement for not using continues in Missions 19 & 20. Also, if you get to the Game Over screen you get a special zoom-out of the Qlipoth tree, which is a nice touch. They planned it to be very hard, and in a game in 2019 that's actually a miracle in my opinion.