Why even pull the log in the first place? I have a hard time believing it poses more of a risk to that bridge than it does floating downstream. It's eventually going to clear itself anyway. Poor choices... On the bright side, there's an opportunity downstream for someone with the means to salvage a sunken boat.
They let all types of guys drive boats. Even high ranking low number guys that think they have "skills". It's pretty obvious you have two of such guys on the boat and one non boat guy that just wanted to go for a ride so he didn't have to shag calls for a couple hours...
They need to get a small tug boat guy that does ship assist to give them some training. Of all the assists from a tug I've had through the years I have never seen one put a line up to us that wasn't hooked to their bow. Even when trying to get off the dock with a strong onshore wind they would always use a bow line and back away to help us get off. They wanted to take away the chance of the guy on the boat (me) putting too much forward way on and dragging them backwards. Basically the same thing happened here, it was the current instead. But.....they weren't thinking.
Can’t believe not one of those 3 thought to cut the rope for hell sakes! They certainly had plenty of time to do that. Course maybe none of them or the boat had a knife. I always have 3-4 knives available in a boat. One on my person at all times.