I took your challenge.
But then I was like hey. Why use armor this is easy.
I don't really count that last one as beating Sir seeing how I was bugged and he couldn't attack, I may redo it sometime
Ouch that might be the problem. You're using an integrated graphics card.
I had the same problem with this and other games before I upgraded my graphics card.
The modding capability for Exanima is bare minimum right now. So thats the best I can do, sorry. But I can change the scream to a different sound if you're interested