@Midnightgunner with double equals signs Also, totally not in cold blood, he was the one who attacked first, and all three were trying to grab the weapon. Also, fortunately, Yang was early, so the League of Evil Exes was small.
^This is how it's done for victims with a hole through to their lung. The one administering CPR must remove some clothing in order to form a skin-tight seal around the victim's nose and mouth to prevent the air they are blowing into the victim's lung from escaping.
So I tried suggesting tags for both doujin and series, but it wouldn't let me, so I put in a suggestion for a prequel tag and we'll see where it goes from here.
It should at least show up on the series page for related images. Lots of series here have related fan art appear on their page, but this should have priority since it is official and it actually had plot relevance to the source.