Owen said he had shared the experience with his class for news yesterday morning.
"There was a man standing right by the T-Rex and the T-Rex roared and the man ran away - it was funny."
The colossal creature remained his favourite dinosaur, as shown by his tyrannosaurus rex T-shirt.
The competition prize included flights courtesy of Air New Zealand, while the Brain family also enjoyed premium seats for the night and stay in a family suite at the Waldorf Stadium Apartment Hotel.
Based on the award-winning BBC television series, Walking With Dinosaurs has been playing worldwide, featuring realistic and life-size versions of 10 species, including tyrannosaurus rex, plateosaurus, stegosaurus and allosaurus. The largest dinosaur, the brachiosaurus, is 11m tall and 17m from nose to tail. It took a team of 50 a year to build it for the production.