Hockey can be a cruel and unforgiving game. You can follow a good process, make significantly more high-value plays than your opponent, and still lose the game because of randomness.
This is why stats nerds like myself keep preaching that “goaltending is voodoo” — because of nights like these. We might as well call this The Karel Vejmelka Game.

Image from HockeyViz.com
The Leafs should have scored at least five goals in this game, maybe even six (since you can’t score 5.6 goals on the scoreboard).