Moonlight awakening

[Jordan The Rock]

For the above, how do you get this to work? I can't find any guides and the in game tip I follow with no luck.

I try..
Active moonlight stance > Activate trance > Try moonlight

This just gives me a horizontal swing.

I've tried it all and I can't seem to get it to work.

I thought the set pieces were bugged due to using a Jar, but even with the golden helm its the same.

Any tips please?