>>281658979
There was a literal author note explaining and apologizing what happened in the manga. He mentioned the later half of the series was his most stressful times in his life because he was going through a lot of shit stress, health issues, and on top of Jump editors pushing "THEIR" ideas for the series adding to more stress. It got to the point where he broken down and blockaded his office just to keep them from coming in and middling with the series because they were that pushy. Dragon Ball had ended while YYH was still running so eventually YYH became the next big hit in Japan and Jump probably just wanted another Dragon Ball Z. By the final arc he just want to end the series quickly.
He most likely lawyer'ed up after the incident and is why Jump still keeps him around and let him release HxH chapters whenever his feels like it. Any other mangaka would have been axed by now and Jump is quick to axe a manga even if it was popular at one point.