Are you talking about the bit that he cut off, or the actual line, with the stinger sticking out far enough? There still would not be enough force to cause a chip to come off of the glass, in that it would cause the type of damage you are stating.
Without pictures to show what you are talking about, along with the item that supposedly caused the damage, it is hard to realisticly perceive that when the stinger hit it, that there would have to be enough force. It would have had to shoot off like a bullet out of a gun, or off of a sling shot, along with being heavy enough, from a distance to cause any type of visual damage. The person would have to have been standing right against the tv holding the wire close enough within a foot, and that the dykes would have to have enough force to cause the projectile to move fast enough to chip the glass.
Again, without pictures, there is no proof to everyone else that this happened.