I agree that proning probably wasn't indicated in this case, but I'll never forget this case I had a few years ago. Guy in his 30s, hx of GSW abdomen and multiple resections, anastomoses, and leaks. Had been in hospital for weeks. Stable'ish clinically on 2l O2, but had an ileus. Coming to OR for washout and G tube revision.
Long story short, at end of case CRNA pulls tube when he is stage 2ish and he aspirates. I come to room and she's fiddling around with trying to change pulse ox sites. Sat is like 70s. I re-intubate him, aline, ABG confirms hypoxia. Put him on LPV in the OR with high peep/fio2. Bronch and I'm able to get some of the schmutz out. Still can't get sat above 75. C-arm in, no pneumo or lobar collapse. I get the SICU attending to OR and we prone him. Gets the sat to high 70s low 80s. Guy is getting hypotensive at this point and is on levo and vaso. Over to ICU, prone, paralyzed, on APRV. No big response to inhaled flolan. No VV ecmo at the time. Sat never came up significantly and pressor requirement never came down. Dude didn't even last another 18 hrs.