Doesn't matter much. I attended a lecture by a lawyer (pro-gun) about the legalities of self-defense shootings. and in the eyes of the law, anything that can be used to cause bodily harm and/or death will be classified as "a deadly weapon". I used a ball point pen as an example and yes, if I managed to cause bodily harm and or death with a ball point pen, I would be charged with assault with a deadly weapon. Every child in america is going to school with a deadly weapon in their backpacks. Yet I don't hear a clamor for assault pen or assault pencil legislation.
It doesn't have to make sense, it is just the way the law is written. Common sense no longer exist in our legal system. The politicians make it up as they go along and write legislation excessively vague so it can be interpreted to their benefit no matter the situation.