The Hidden Blade Assassin's Creed in Depth

Assassins Creed Unity Sequence 4 Memory 2, Le Roi Est Mort, Le Roi Des Thunes Assassination.

This isn't anything special, just reaching the end of the sewers without finishing the memory.

Parrying attacks from the target can knock him off the corner of his platform without incapacitating him. From there move him to the closed gate using staggering strike.

After the memory scene, the gate opens up. From there you are on the other side of the checkpoint marker. Now when you reach the end, no scene starts, and the wall remains intact.

Climb up the two flights of stairs and you can go no farther. Nice view of the tunnels and their transparent ceilings from above.