How to Perform the Katana 2nd Parry?

[Golbez]

This may sound odd to some, but i've seen it happen. Essentially when you parry an enemy with a weapon (or in this case a katana) you can stab them for lots of damage.

However, I've seen sometimes where when you parry, then stab, you can do an additional stab downwards for even more damage. This is exclusive to the katana. I even saw a video on it but i can't find it now :/

[Vincegame24]

Use the weapon art (on a playstation controller its the L2 button)
Then use light attack button to perform a slash and heavy attack to perform a parry

[Tendril, Knight in Yellow]

you are talking about the Hornet ring.
its not an exclusive for the katana, as you put it.
For what ever weapon you use, it will give an additional animation with added critical damage.

[SuperSam]

You saw the riposte under effect of hornet ring, not only specific for katanas.

[Khathuluu]

Yeah, it is the Hornet Ring, not a katana specific finisher.

[Krampus]

http://darksouls3.wiki.fextralife.com/Hornet+Ring

[.]

As others have pointed out, it's the Hornet Ring.

Heavy weapons have their own Hornet Ring animations as well.