I thought that a certain post wouldn't last long, am surprised the Mods let that particular post stay up for that long! It was rather nasty & by the sounds of things a reaction that was perhaps latter thought no appropriate, well the Mod/s thought that.
Anyway whether or not this guy checked the oil is now academic (am sure he is wiser now anyway one way or the other) The question now remains the A/C in question arrived back from the previous jaunt with obviously a low oil quantity. (YPJT yr comments are spot on) The 540 in good nic burns little oil & with 12 qts (if kept full should give the engine many hrs of safe ops( I used to overhaul them in another life & around 8-10 qts was the norm for day to day Ops) so it's quite possible that the previous flight was undertaken with less than the optimum oil qty so the next guy to fly it the subject in question here was the bunny to wear the end result. If it wasn't him it could very well have been the guy flying it the next trip. Obviously there is a problem here (again as YPJT mentions) whether it be poor maint or something along those lines or just poor airman-ship either way a lesson to be learned for all who fly these type of craft in these conditions.
Wmk2