You guys and your fear of outboards. :-D
A Honda 9.9 four-stroke is hardly a "putt putt" motor. The Power Thrust version, which a sailboat would be equipped with if it is a Honda (looks like in vid), has a 4 blade 10" low pitch prop, lower gear ratio, special anti-cavitation exhaust relief, and a long shaft. Intended for sailboats, unlike motors of the past which were retasked dinghy motors.
10hp correctly propped is nothing to sneeze at, when it's employed to drive a 26 footer. Fantastic power for this task.
The motor was not running. Look at the vid. No prop wash.
He was sailing parallel to the swells at the time of the impending incident. Plenty of ocean to dig that motor in, and the stern will squat under power, digging in further. The boat is not going to rock like a seesaw, with the prop trying to fly it like a plane.
Anyone who has sailed an outboard powered boat for many years can see the skipper had a clear channel to get moving under motor. Had the motor been running, he could have been up to speed and cresting swells to port in about 7 seconds with that much power.
Things just happened too fast. He got trapped in a matter of seconds, and the motor wasn't running.
Had it been, and he had snapped it in gear after the U-turn, this video wouldn't exist.
Edit:
The most vulnerable time for an outboard is when the boat is not moving. We outboarders (previously, have diesel now) can all tell stories of steep chop and the motor splashing around at a stop. Under way, as I said the stern squats, and the motor rides in the wake of the hull, like any power boat.
I've come in in the past during high chop and big swells no problem. And that was with a transom mounted Honda that was likely higher up than on the video boat.