To get an idea of what it might look like do the following (not very far off the ground!!!!)
Start prusiking up a rope, stand in your foot loops so all you weight is on the hand jammer. Remove your chest jammer whilst keeping one arm wrapped arround the rope for support. You should now start very slowly, but inevitably to turn upside down, you will be totally helpless and not very safe. Your arm will fail to support you, the only way out of the predicament is somehow free a foot from a foot loop and hope it can still reach the ground as you try to get round the right way again.