[talmand]

Depends on intent. Your example of manslaughter would imply no initial intent to cause harm, therefore you are held responsible for the outcome and not what caused it. If you were to shout fire with the intent to cause death, then that would be premeditated murder. In that case you are held responsible for the outcome as well as what caused it.

Regardless, you certainly do have the First Amendment right to shout fire in a crowded theater (the quote everybody refers is bad law), the government will not actively try to prevent it; you just may have to deal with the legal consequences of using your right in such a way.