Joe, Scott... It sounds- and the sketch looks like- it is on the front of the mast. He makes no mention any lights are on the other two brackets, wether for R/G or deck lights. If it's a halyard (and to assume it's the heaving end), it probably goes through a block at the top of the mast, on center, for the jib, and would/could be subject to being against anything that is ANYWHERE down the mast- like a bracket.
Finally, He said it "snagged", so maybe is not an every-day postion of concern- just this one time? But all the same, that looks like alot of wear. As usual, we do not get all the info up front, nor a picture to go by- and thus we get a thousand words.
As an added thought, I can't help but wonder what the welding would do to mast strength if all three are at the same level???