Perhaps Cap Huff is onto the same track ...
It appears that the bunch of balloons rise after the first explosion, followed by the second explosion 120 yards away. The balloons had elevated perhaps 100 feet in the air whent he second explosion happens. I’ve been unable to see if there were balloons down at the second explosion. Whomever was holding the balloons would have had a line of sight —it would appear— tot he first bomb and the balloons may have been the way the signal was radioed to the second bomb. If anyone has video links to the second explosion, from the dept store cammera perhaps, I would like to know if balloons rose up near the second explosion, indicatinf perhaps a third bomb was sup[posed to be detonated via balloon carried signal.