Added to 9/24 update:
If you’re knocked off the bridge, your checkpoint will be set on the other side, so you can accept the death and bypass the puzzle, or try it again by reviving at the start. (You’re downed if you fall so you can self-revive.)
Thank you for adding that, I’ve been stuck at this one for a while. The flags seem to not be loading right on my low end computer. I’m trying it on my husband’s fancier one and I can see the flags but it’s just super difficult now.