[Snake]

After defeating an NPC enemy or attacking a knocked out Player, upon using Sheath Sword (Fatal Stroke from Hisen) on the same round, the potential skill's visual effects will still activate even if there is no valid enemy to activate Hidden Cut towards.

This will make it so the screen becomes red, but, given there are no enemies available to receive damage, it will do nothing as Hidden Cut will not activate.

The skill should probably check if Hidden Cut's damage will proc before attempting to do its own effects.