I was playing bloody palace with Dante today and was just trying out a bunch of different moves from the different styles, and i figured out that when you're fighting Bianco Angelos, the move "Shotgun Stinger" will stun(by stun i mean where they kinda lean backward for a minute and stop moving) them almost every time. It will definitely stun them if you hit them in the back and sometimes it will even stun them if you hit them on their shield. even if a hit to their shield doesn't stun them, it only takes a few Shotgun Stingers to destroy their shield.Hope this helps 
PS. you get the move Shotgun Stinger by purchasing level 4 Gunslinger
PS. you get the move Shotgun Stinger by purchasing level 4 Gunslinger
