Abstract: Active Shooter Hostile Events (ASHER) are occuring with increasing frequency internationally. The recent events in Nova Scotia, where a single gunman with no identified pre-shooting pattern of Radicalization to Violence employed a highly adaptive approach to inflict the largest death toll for an ASHER event in Canadian history, is a tragic yet highly pertinent event of why Canadian Law Enforcement (LE), Fire (FR), and Emergency Medical Services (EMS) agencies should operate under the assumption that incidents similar in size, scope, and complexity will occur in Canada in the immediate future. This event has shown, once and for all, that ASHER incidents can no longer be considered “an American phenomenon”.