Any move that results in your lines twisted will cause abrasion on your back (steering) lines. I had just noticed excessive wear on my lines (that I have used well over a hundred sessions) and I ordered a new set of lines.. but as fate would have it a rear line broke later that day (while I was downlooping). And it broke right where the lines twist together.
So just a reminder that if you downloop every jibe as I do (or do roll tacks as I sometimes do), your lines get twisted and get a lot of extra wear where they twist together. This is usually very near the bar. Obviously you should unspin your bar to untwist them as soon as possible to avoid even more wear.
Anyway it's a good idea to inspect them.
[I'm not suggesting that you give up downlooping ]
CG