Nondeadly force can be used to repel either a nondeadly attack or a deadly attack. Deadly Force may be used to fend off an attacker who is using deadly force but may not be used to repel an attacker who is not using deadly force.

What is Virginia's Code Section on Use of Deadly Force?

Deadly force generally refers to any degree of force that would normally cause death or serious bodily injury.

It depends on the state. A very basic rundown is: in some states, a homeowner can use deadly force once an intruder has entered the dwelling. In some states, a homeowner can use deadly force before the intruder is in the house as long as they suppose a threat and are on the property. In some states, the homeowner cannot use deadly force unless the intruder has a weapon.

They call it deadly force, but if you resist with a deadly weapon and you have committed a serious crime and they find you, they can.