Matsu is a quite high-ranked minion of Hōgen.
Ginga Densetsu Weed
As the fight becomes worse, Matsu's minions bring Lefty to him. Matsu tells Lefty that he does what he does to protect his family, but Lefty sarcastically tells him that his children must be proud of a father who lives by trampling others. Angered, Matsu kills him by ripping out his throat.
He then retreats to the back again, waiting for Hōgen to show up and finish off John. After John's death, he returns back to fort along with other minions.
See more pictures in Matsu/Gallery.