Strafe right or left, jump, use a weapon with a ttk faster than the charge time. You have to make them miss. The crouch around invis corner precharge nerds can be tough to get, but it's doable. Been a fusion main since d1 and they can be killed easily with the right weapons and tactics. If you're using a shotgun, you're already toast. They're a direct counter. Like rock paper scissors and your paper and they're scissors.