That's Vax's job.
To stab at the face means, when you are in confrontation with the enemy, that your spirit
is intent on stabbing at his face, following the line of the blades with the point of your long
sword. If you are intent on stabbling at his face, his face and body will become rideable.
When the enemy becomes rideable, there are various opportunities for winning. You must
concentrate on this. When fighting and the enemy's body becomes as if rideable, you can
win quickly, so you ought not to forget to stab at the face. - Miyamoto Musashi