...I hope this conversation is about where to go to AFTER you shoot center of mass and the target doesnt go down...
I suggest "where to go" is anywhere. ie move your entire person, not just your aiming point. Preferably toward cover and concealment, and even better AWAY from the area. But whatever you do, MOVE. That's the whole point of my suggestions here. Think of ANY gun like it's a mini flash-bang grenade. Even if it doesn't hit, do optimal body cavity damage and all that ideal ballistic stuff, even if it's a miss, it's a big, disorienting, scary BOOM in the face of the target. That gives you time to move, re-assess, re-evaluate, run away, put more distance between you and the threat.
Sgt Lumpy NREMT-P - n0eq