This not behavior or scripted mod. There no new attack or hotkey. This just the regular power attack but i am using dynamic animation replacer to change the animation depend on the movement direction. My mods are open permission, you can upload or modify them without contacting me. but if you make xbox conversion then consider contacting me so i can share the link with other xbox users. You can also comment on the video if you have a question.

Xbox conversions by SkyFall_515
Two-Handed 3-Hit Power Attack Forward
https://bethesda.net/en/mods/skyrim/mod-detail/4170544
Witcher-Style Power Attack
https://bethesda.net/en/mods/skyrim/mod-detail/4170542
Greatsword Forward Normal Attack
https://bethesda.net/en/mods/skyrim/mod-detail/4171207
Heavyblade Attack Combo
https://bethesda.net/en/mods/skyrim/mod-detail/4171209
Heavyblade Forward Power Attack
https://bethesda.net/en/mods/skyrim/mod-detail/4171210
Dual Wield Forward Power Attack
https://bethesda.net/en/mods/skyrim/mod-detail/4171166


My other Animations