The only “sandbag” I saw was a small bag that looks like it was being used to weigh down the leg of a mic stand or something. That’s done all the time with audio stage gear, and whatever it was stabilizing would have been in Biden’s path as well, so I’m not buying that explanation.
Someone needs to dub “Off We Go into the Wild Blue Yonder” over this video.
The problem the SS and event planners have is Biden wanders off after giving a speech. He was in front of the podium when he tripped and fell. Maybe he tripped from a sandbag, but I doubt it. I am more inclined to think it was a bump strip protector(floor cable cover)...