Problem with the graphic (need help)

Hi there,
sorry for my bad english :wink:
I dont know if anybody saw this before. The game runs good on my Low End PC.
But in Story Mode when i fight against Geoff i get a graphical error, but only when i turn my face in the direction of Geoff.

Look at this Pic:

here is another in the Second Story Mission:

Can anybody tell me why?

Greetings ToyChip