Did you ever feel like moron when you won? My heroic Alekhine attempt finished good for my only by luck. I can cure myself from fast playing first 10 moves I made with totally 1 seconds per move. When that happens my playing strength falls at least 400 points :-(
Game 3778040
Game 3752109
similar situation/mate, though nowhere near as much a disaster as yours 😉
when people are way up, as your opponent was, they miss things, like mate threats. nice save