Thanks for the video. It makes it easier to see what's going on.
General note: It seems like your henchmen are already attacking the Knower before the console command is run. I would command them to follow peacefully (or leave them outside the area if possible) so that they (and the Knower) aren't in attack mode before doing anything else.
Regarding DM Client: You should be able to use the DM client on a single-player saved game. Keep in mind that you open the saved game in multiplayer mode and save it, but that won't prevent you from loading/playing it in SP mode later. Obviously, keep a copy of an unchanged saved game until this issue is resolved. Anyway, the process is basically: Open DM Client; click Multiplayer; Load Internet/LAN Game; pick the saved game; choose the DM character (any should work); and click play. You can use the chooser to jump to the Knower's area. Now I am not as familiar with what a DM can do in the standard game, but I am pretty sure he can make a creature nuetral or reset its faction. Maybe even one of the
console commands (like
dm_setfactiondefender
) will work here. Anyway, try that and then save, quit, and reload in SP mode to see if it's changed.
Regarding the script: The script looks like it may have worked, but henchies attacking the Knower will make her hostile again. Get them to sit quietly and then run the script and see what happens. BTW, I think the script should run even when your PC is not yet in the Knower's area. And it should work while the game is paused, which may be helpful if she or the henchies insist on attacking while you try to run it, regardless of what you tell them