The Hidden Blade Assassin's Creed in Depth

Sequence 7, Memory "Motion to Impeach" from Assassin's Creed Syndicate
James Brudenell Assassinated and area escaped with no other Kills and no Detects before the Assassination moment.
* * *
RULES:
1) No Kills or Knockouts except Targets, unless Required.
2) No Detects except upon Assassination Moment
- Awareness Meters are allowed.
- I will try to avoid being detected during Assassinations as well, but if it's necessary, it's fine.
3) EQUIPMENT:
- Wear the Upgraded Beer Collector Belt for Jacob and the Upgraded Aegis Cloak for Evie.
4) No Side Objectives
5) No HUD except Awareness Meters and Tool Indicator

I thought this mission would be really hard to pull off Non-Lethally, and cleanly. That was until I remembered that Kidnapping makes you invisible in this game. I first tried to use the blue guard marked as the Stealth Opportunity to get in, but I discovered that the red (Templar) guards inside the building would still detect me. It seems Kidnap is only effective as a Stealth tool when the person you've Kidnapped is part of the same "faction" as the guards you're trying to sneak past. Kidnap makes getting through Restricted Areas a breeze, albeit one with a necessarily slow walk speed. The slower you walk, the smaller the Blend Circle around Jacob shrinks. Not visible in this video because I have most of my HUD off.

I show off another good moment to use the Smoke Bomb's ability to go through solid objects. It's not actually a real cloud that forms and can be stopped by cover, it's just a Radius drawn onto the game world once the player throws one.

During the escape, Kidnapping and walking out with a guard doesn't work. I tried it a few times, in different ways. The others always get alerted to the dead body on the ground and it seemingly breaks my Kidnap-invisibility. So this is the second mission in which I'm Detected during my escape. Once I finish, the end-of-mission card tells me that I was Detected by the Target. I think this is a bug, because he and all of his guards were Smoked and had no way of knowing I was there. This does not happen if you use the Unique Kill. I didn't want to use it here because it would break my Non-Lethal rule by killing someone other than the Target.