you also get the unhit feeling when you are hit a split second before you shot (& hit), because you die but it takes time for your client to acknowledge that. ping matters.
No, I often empty entire clip, and then die, the guy "had 100% health". But when my stamina is full I empty half the clip and already get a frag. Maybe it's because I can't use evasive maneuvers with my stamina low, but doesn't really matter. I know well my idea was unrealistic.