OK, in what universe is he 'lucky' to be alive? Would anyone like to propose that the expected result of being scalped by a bear is anything but death? Anyone? Bueller?
He fought back, kicking the bear and punching its face. The bear released him and he ran inside. The bear had bit his abdomen and torn away part of his scalp and his ear, and he was bleeding profusely.
"There's a lot of blood I'm sure up and down the stairs," he said.
Without cell reception or a landline to call for help, Mr Carbery ran to his car as the bear chased him and drove himself to the nearest hospital.
While full of admiration for this gentleman's tenacity and instinct for self preservation (ignoring his questionable decision to approach a pair of grizzly bears without any kind of firearm, let alone one chambered in .700 Nitro express) I don't think we can ascribe his survival to anything other than sheer luck:
...the bear caught up with him at the door, picked him up by the skull and tossed him to the ground, he says.
If an anecdote in your life includes the words "picked me up by the skull", and you're recounting it, you're clearly luckier than the average.