I'm wondering if this is a reference to the assassination of Abe Lincoln; Killed in Ford theater by JWB, etc..
Probably going to provide a lot of leads with that many images….
Uhhh… maybe the approach used. It wouldn't be the first.
https://yournewswire.com/arizona-shooter-sues-gabrielle-giffords-saying-he-is-mk-ultra-victim/
Searching the web seems to imply that "crossing the red line" is breaking a deep state rule that would result in death of the person who did it. Nothing solid though.