Thanks for the advice guys. I wasn't making him nervous by watching him, after I make sure he's killed the mouse and started to munch it I leave him alone in my room. I tried to gently remove the mouse and he struggled against that so I stopped, and just a minute or two after that he started moving around and eating. Slowly, but he consumed it completely within an hour or so, and now today he's acting normal. Being reclusive but that's regular after eating behavior. I don't know what was going on. Hope it doesn't happen again.

Thanks!