So I was trying to solo a Champion and ,of course,I got into the downed state,so I immediately used the shadowstep to get out of harms way and with some lag my character model was completly transparent and everytime I fight a mob it never enters combat state.So basically I can kill mobs without them attacking me but they still regen thier health since they are out of combat,the only way I found to get back in normal state was dying.