First off regarding the green jeep, they were not on the correct line for that obstacle for a swb vehicle. Whether she would have gone fast or slow the out come would have been the same if she continued. If she had crawled it (tough to do with stock gearing) she could have stopped and then backed down. The correct line in that spot is actually several feet farther over to the drivers side. By getting further over you miss that big hole that the passenger rear drops into which causes the roll.
So knowing the obstacle, the long and short wheelbase lines, etc helps a lot.
Randy Rosetta KDØKWX TLCA #19351 69 FJ40 "Meanie" & 1970 Boss 302 Mustang