A person entering into a casino contrary to posted conditions of entry is arguably engaged in criminal defiant trespass and/or has no right to be there. In either case they could not avail themselves of the protection under the Stand Your Ground statute.

18 Pa CSA 505(b)(2.3) An actor who is not engaged in a criminal activity, who is not in illegal possession of a firearm and who is attacked in any place where the actor would have a duty to retreat under paragraph (2)(ii) has no duty to retreat and has the right to stand his ground and use force, including deadly force, if:

(i) the actor has a right to be in the place where he was attacked