A major concept we teach is "stacking the edge". An edge is defined by a greater probability of something happening over another. In this case, because of all of the Content and Context on the USD/JPY chart at the time of entry, we felt that we had a greater probability that price was going to go lower than continue to go higher.
This is the only job as a "trader" is to find price edges that we can exploit.
Watch for a great live example here of "Stacking The Edge".