You certainly can if they are approaching with violent intent.
Did the shooter attempt to deescalate by fleeing. Did the shooter start the altercation? Is the attacker 6'4” and a karate expert or is she 14 with asthma? Is the Vic 88 and in a wheelchair, or a 22 year sprinter? There is no blanket, even in states with SYG Laws.
Just ask George Zimmermann!