*The easy way to escape*
I personally got this on high chaos rating, but if any of you guys are aiming for low chaos, let me warn you. When you exit the tower, the guards will still be there. This is an easy way to escape. When you go into the backyard (after killing Lord Regent), you should see a guard leaning on the rail talking to another guard. DO NOT KILL HIM!! Instead, immediately jump over the railing, into the moat. You can do 1 of 2 things: A) Possess a fish, or B) Blink your way down the moat. Either way works. Then, pop up on the ledge. You should see a set of stairs that leads to a room. Take them. There is a health elixir and a mana elixir in the room. Take them if needed. There is a guard patrolling the adjacent walkway. Take him out. Then, take the walkway. It should lead to a collapsed part of the building. Proceed to the bottom. You should land near an open garage door. Go out. You may wanna blink across the railroad tracks, because there is a swarm of rats eating a corpse. Then, proceed forward. There is a staircase there that leads to the courtyard. DO NOT TAKE IT!! Blink past it. You should come to a wall over a cliff. Leap over it. Now here is the most important part. Blink as far as you can out. Then, GERONIMOOOOOO!!! You will land in the ocean, thus you will live. Then, just swim to Samuel. Bam! Chapter complete.