For those that know Eagles, what was that Golden thinking attacking that goat? It is my understanding that a 10-15 lb Eagle can lift/fly about 4 lb animal.
The eagle is most likely trying to force the goat to plunge down a drop that would kill or weaken the goat enough for the eagle to finish the job. Why the eagle did not give up sooner and risk its own life to that degree is anyone's guess. There are many videos on YouTube showing eagles successfully driving large animals over cliffs. This is just one that was even more spectacular than the successful (for the Golden Eagles) ones.