Our armed security is mostly to filter out exactly that type of scenario. It is very common for individuals who have been shot/stabbed to not want to disclose who assaulted them (surprise surprise, but not our problem really). It is also very common for them to want to call their "people," which is definitely our problem.
Last time we had this scenario our patient was stabbed (but not badly, no major vascular injuries) and very intoxicated. Very insistent that he be able to call his "people." He became very confrontational and we called a team to intervene/restrain him. While he was being talked down and before the team arrived, a nurse pushed a "B52" into his IV (haldol, versed, bendaryl). By the time the team arrived, he was very cooperative and then PTFOd for 7-8 hrs.