In the Matrix and in Inception what happened in the virtual world effected what happens in the real world. And just like in those movies if the victims mind thought they where shot they actually body showed signs of being shot. Take Sean for example. He should signs of his gun shot wounds that did not actually exist.It is one thing to create a psycho somatic condition. It is another for the mind to perform psycho somatic healing. At least to have it happen fast enough to heal a stab wound. You would have to accelerate cell regeneration. You can damage cells instantly you can't heal them instantly. Again you can't defy physics.
Embrace your inner Biest..... We all have one