Engine and prop use the engine oil here. Lose oil pressure and you lose prop control which is very serious. Luckily the fine pitch stops here were set pretty coarse and he didn't seriously overspeed either to cause a catastrophic failure.Oil can be seen stream out of the cowl from every outlet, and he reports loss of power. Though the latter could be a result of the prop pitch, that alone does not explain the black oil everywhere does it? The prop is, I presume hydraulic? But the engine is losing the oil, the two oil systems are not linked are they?
Anyway, like any good TV series, it is to be continued, though of course we know he gets it down safely.