Brenton Dyer was digging under his house at Valla Beach, south of Coffs Harbour, last week while his children were playing on vacant blocks that were part of a subdivision at the back.

When he heard the first scream, he thought it was just a cry of irritation between sparring brothers, Jedd, 10, and Lewis, 5.

Lewis Dyer's injuries from the kangaroo attack at Valla Beach.

It was the second one that turned his blood to ice.

"I looked out and all I could see was a cloud of dust and Lewis on the ground being stomped on by a kangaroo.