Same thing happened to me in one game me and a buddy land in airbase, random lands near respawn and dies instantly. My buddy runs into a room with a bloodhound punches him and is immediately dropped with a peacekeeper. He ties to finish my buddy I walk into the room and tag him for 45 with my peacekeeper, we then trade hits for another 45. Then I tag him for 20 and then run out the door but get clipped and die . When I was in spectating he had zero health whole bar was empty and he had no shield
battle report stated I did 110 damage and my buddy did 30 I think there is definitely and bug in health limit