Some years back, a PGA player was DQ'd for using two caddies. The scenario went something (not sure) like this. The player and his caddy had a friend walking with them. I think the caddy was the golfer's son, and friend was the son's friend. At some point the golfer passed the club to the friend, who passed it to the caddy, hence the player used two caddies and was DQ'd. Not sure if a wrong score card attributed to the DQ.
Here's my question. Scenario; during a swing, the golfer loses his grip, and the club flies off the fairway into the gallery. If someone other than the golfer, or his caddy picks up the club, and hands it to the player, who then hands it to his caddy is that the same as using two caddies?