how to get the Thunder Katana secret weapon in ravenfield!!

EDIT: YOU DO NOT NEED TO SHOOT THE REFLECTION JUST AIM AT IT WITH A SCOPED GUN! ( i used the slam-r) i made a slip up and i thought you had to shoot it bc thats what ppl in the discord sever were saying when ppl first found it, but thanks to ‪@FeelsOkayMan1337‬ for saying something. sorry i was misleading and wasted some of your time