I didn't want to hijack either of the other thread(s) on casting and I do have a question about the use of a strict overhand cast.

If you adhere to a strict 'overhand' cast, meaning 90* up/down, won't the motions of the backcast and the forward cast intersect and hit each other or hit the rod? I think many rods have been slammed by the line, the fly and split shot (or something else on the leader/tippet) and damaged by casting in a strict overhand casting motion.

Any comments about this?