Agree. Also, that pulsing of the exhaust smoke looked like it may have swallowed a valve. I didn't see any oil on the cowl or windshield, so most likely an internal failure, akin to a "contained" failure in a jet. When a jug blows off, most of the oil seems to end up on the windshield and forward visibility becomes about zero.
He did a great job with it - the only criticism I could make, with the benefit of 20/20 hindsight and sitting here in a cool and calm environment, is that it might have been a good idea to push the canopy open before touchdown, just in case it jammed. Judging b