My thought on Nightmare's Patch Notes:
"Fixed 6K whiffing issues" - Was rare but cool.
"66 KK 2nd hit don't whiff on RE" - Still interruptible by RE so whatever.
"GS A+B hitbox expanded" - This gonna work in combos as intended.
"2A+B meter gain buff" - Already fills up 1 bar in 3 hits so...