Why is the medal a 'sign'?
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When flesh hits the telepod.
The medal was given to Kane by Cutsaw early in the film.
shareI have to agree with a friend of mine that it is a bit hokey, but I'm okay with it. :)
The "sign" was that Cutshaw gave his St. Christopher medal to Kane earlier in the movie (as stated in a previous post), so Cutshaw finding his medal in the car was a miracle (as it should have been with Kane, or simply anywhere BUT in the back of Cutshaw's car).
PS: St. Christopher is the patron saint of travelers, and was also a factor in THE EXORCIST (the falling medal you see during Father Karras' dreams is a St. Christopher medal).