I think that it is a viable option to fill the void in the force continuum below that of lethal force. One, in many states, a (simple) assault, such as pushing, grabbing, hitting, blocking your path, etc, without some other does not justify a lethal force response. Two, if one has deployed a non lethal option and an aggressor then escalates their threat, you will have both taken a prudent non lethal step to evade and avoid as well as given yourself concrete confirmation of their harmful intentions.

