Note

Leo goes to stance by holding 5H.

While in "stance" can't block, but can use parry.

Normals

5H

Gatlings into 6H and 2D

Level 4 move and -3 on block. On IB, it's -7, therefore our available options are:

5P

2P

5K (longest range button from the listed ones, active at frame 7, therefore the punish has to be frameperfect)

2K (Has a lil' shorter range than 5K yet it's active at frame 5, allowing more consistency)

c.S (use if close enough)

The punishes are also tied to proximity.

For consistency due to 5K requiring to be frameperfect to gain slightly more range, I recommend going through the 2K routing when available.

2K whiffs slightly after the rounds-tart distance, where 5K .

Important Disclaimer:
All of this options get smoked by 5H>2D frametrap!!
All of this options beat 5H>6H

Routes

5K

Round start

5K > f.S > 5H > Bridal/5H*4, damage: 89/80
5K > 2S > 5H > Bridal/5H*4, damage: 87/78
5K > f.S > 2S > 5H > 5H*4, damage: 102
5K > 2D, damage: 43

5H_punish_5K_roundstart.mp4

Slightly past round start

5K > f.S > 5H > 5H*4
5K > 2S > 5H > Bridal/5H*4

The bridal ender route is quite finicky due to range and requires 2S to work, yet, if the spacing is slightly further, bridal will be blocked, therefore for consistency is recommended to be skipped.

5H_punish_5K_slightly_past_roundstart.mp4