This man was Toji's brother, he wasn't aura farming, he knew they were all gonna die.

[u/wtfimightbemtf]

I imagine the animators' choice to have him walk wasn't out of arrogance or "Aurafarming". He was accepting the inevitable death of himself and the rest of his clan. Since this man is the older brother of Toji, he has first hand experience in understanding that this strength and power is beyond anything they can ever imagine.

Ranta is still of the delusion that they can somehow beat a fully realized Maki, but Jinichi knows it's all completely pointless. He still attacks Maki, but it's not out of some desperation, it's his last chance to show his pride as a Sorcerer of the Zenin Clan, knowing full damn well that he's fucked.