I think Yashiro is probably trying to protect Doumeki bc he doesn't believe or is not sure he'll leave alive. He wants Doumeki to live bc he loves him. Doumeki is clearly very head strong and so Yashiro decided to shoot him to finally keep him at bay.
I think Yashiro is probably trying to protect Doumeki bc he doesn't believe or is not sure he'll leave alive. He wants Doumeki to live bc he loves him. Doumeki is clearly very head strong and so Yashiro decided to shoot him to finally keep him at bay.