Hello, I've recently started to play Dishonored and it is really awesome game. I am currently on mission where i have to kidnap Sokolov and have a strange bug. When i was using Possession (have Tier 2) in all areas, everything works fine, but when i got to the Sokolov's house and try to possess some guys, then i get some screen lag. While possessing you see that you go through red screen (some nerves i think) to the point when you control the body (human, rat,...) and everything go smooth. But there it doesnt work properly and the process through "nerves" are slowed down to freeze. I can normally walk around, do anything i can while possessing, but screen stucked on that nerves.

I tried it many times and sometimes it stucked for longer time, sometimes for shorter time. Anyway, when i end possession, exactly the same thing is happening here (it is slowed down) while you are leaving body.
I thought that it was corrupted save so tried to load some older saves and when i got into the Sokolov's house, same bug again.
When i was trying repeatedly load my saves, i found that it sometimes worked properly. This is also strange that it sometimes works even when i was possessing every person in this house, sometimes it doesn't works anytime and sometimes only first person works and second don't.
I also tried to simply ignore last area around Sokolov's house and go straight into house and it worked.

And I tried to possess people and rats in my older saves (before Sokolov's house or previous mission) and there it worked correctly. Also haven't noticed any problem around Sokolov's house

So my question is: Is this game bug? Have (Had) anybody of you that bug? How is possible that this bug shows sometimes?

Thank you guys for your help.
(I wrote this in detail cause if it is game bug then it should be reported)