mouth a duckbill valve assembly 16 is mounted at central opening 14 the duckbill valve assembly includes a hollow tubular extended portion 21 protruding in the distal direction from the shield 12 and a pair of opposed flexible lips 20 and 22 at the distal end of the extended portion preferably the entire duckbill valve assembly is formed integrally with shield 12 as best appreciated with reference to fig3 the duckbill valve assembly 16 lodges within the victim 39 s mouth when the shield is juxtaposed with the victim 39 s face in use an air deflector 18 is positioned at the upper edge of the shield 12 preferably air deflector 18 is formed integrally with shield 12 and constitutes an edge portion of the shield the air deflector or edge portion 18 is canted relative to the general plane in which the shield 12 is disposed such that it fits above the nostrils of the victim when the shield 12 is in place on the face of the victim as seen most clearly in fig4 and 5 air deflector 18 protrudes generally in the proximal direction from the shield 12 and the air deflector has a concave surface 23 facing away from central opening 14 and facing generally in the distal and upward directions i e towards the bottom and right sides of the sheet in fig4 and 5 thus as illustrated in fig3 the nasal deflector is arcuate and curves back towards the top of the head of the victim and above the tip of the nasal passages or nostrils as a result the air deflector 18 serves to deflect air exhaled from the nostrils of the victim and precludes it from.