The announcer's call says it all, "Look at that! That ball was down! That ball was down and jumped right back onto the table! That is unbelievable. Watch this!"
Witness The Stunner Not Down Under (An Unhappy Accident)
It does look like a little much force and bottom right english may have compromised the stroke. Who can say? I've had this "happy accident" trick shot happen to me. It's no fun.