That bear "expert" is full of shit. 100 yards in 3 sec? That's a ~54 second mile. No way a bear could run that fast.
According to that supposed "expert" a bear can run over 60mph. A quick look around wiki says the average speed of a bear is about 30mph, which isn't a whole lot faster than the average human speed.
The world record holder in the 100 meter dash had a speed just a hair under 30mph, and he did it in 9.74 seconds. So it would take a bear approximately 19 seconds to cover 200 meters, which should be more than enough for the average human to make it to the cabin. I'll definitely take my chances with the bear.
Btw all this info was taken from a few simple wiki searches