Like bald eagles, golden eagles can lift about three or four pounds, a bit more if they swoop down with some airspeed and grab something.
Alaska Department of Fish and Game
Eagles (Bald and Golden)
Feeding Habits
http://www.adfg.alaska.gov/static/education/wns/eagles.pdf
It appears the kid was just a bit to heavy a pay load, but jeez it had the kid well off the ground. Just wow.