That was amazing! Mother Nature is a cruel mistress.
I wonder how those hornets would do against a colony of Africanized honey bees (known as Killer Bees)? My wild guess is the hornets would still win, but more hornets would be killed.
I also found this to be very interesting, quoted from the article:
"Adult hornets feed their young by chewing the flesh of their victims into a gooey paste that the offspring devour. The larvae are well fed, and in turn provide the adults with a powerful energy-boosting cocktail in their saliva.
It's called vespa amino acid mixture, or VAAM. Regular doses of VAAM from the larvae give giant hornets their incredible stamina and energy—when pursuing prey, they can travel a range of 60 miles (96 kilometers) at speeds reaching 25 miles per hour.
The incredible effects of VAAM have not gone unnoticed in Japan: The country's latest sports drink is based on this "hornet power." It contains a synthetic form of components in the hornet larval saliva, which is touted as performance-boosting. Japanese gold medalist and world-record marathon runner Naoko Takahashi declared that VAAM gave her an edge in the Olympic Games held in Sydney, Australia."
This VAAM sounds pretty interesting, worthy of scientific study.