The bullet angle into the metal surface can be approximated by the first 1/3
of the channeled impression into the surface. The angle which the bullet bounced off of the metal can be approximated by the last 1/3 of the channeled impression.
The angle that the bullet leaves the metal may have the appearance of being greater than the angle into the car metal... BUT don’t forget the effects of the metal distorting and creating a “ramp”
for the bullet to “take off” from!