I tend to roses (variety unknown, possibly Knock-Out) for a commercial customer - they are subject to leaf blowers from the mowers (since re-directed!). After a recent post-bloom prune, I noticed red tips and proliferation of thorns on some canes but don't see any deformity (like pictures in some older posts) and the roses have since re-bloomed brilliantly. Are the excessive thorns the beginning and the shrubs just haven't gone full blown RRD?

Pruners sprayed with rubbing alcohol (always sprayed if I move to a completely different plant). Roses are roughly 7 years old - cut back each March - I remove canes if centers appear crowded. Watered by irrigation and not fed because they're in a bed with culinary herbs. I read through previous RRD posts to try to ascertain an answer but nothing was definitive. Many thanks for your thoughts.