There's no way this is true. The ball caromed off the ground towards the wall, overwhelming evidence that it was headed in that direction before hitting the ground. If it had bounced towards Dunn, it would have indicated it was coming towards DUnn because it had already bounced off the sign.
I don't think it bounced off. I said it could have just barely nicked the EDGE of the sign causing it to shoot straight down. That would also explain why none of the fans in the area heard a sound.