If he injures me, if he really hurts me, I’ll have to kill him."
He WAS trying to end the fight in other ways, the problem according to WJM was that BL wouldn't give it up. WJM was beating him pretty soundly but BL was enraged, which matches his personality even according to BL himself, and would not let up. He even began the match by trying to strike at WJM's eyes. Now if it was me, I would probably feel the same way except that at that point, if you don't want to stop trying to hurt you, I may just try to kill you anyway and leave your body for someone else to find.
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I'd tell you to go to hell, but I work there and don't want to see you everyday.