Frozen in fear, the Doctor Who star gave it his best shot, but was left unable to talk due to the mounting fear he felt as he dangled over the cliff edge.
After slipping at the beginning of his decent, the 59-year-old was shaken as he slammed into the rock face.
“I’m going to have a heart attack,” he stuttered, staring straight ahead so as not to look down.
Sensing his panic, Barney could be heard sending some encouraging words to his worried dad.
“What’s the view like up there?” Barney joked, as Brad simply muttered: “I can’t talk.”