In the first round of the NHL playoffs last year, the Anaheim Ducks managed to hold a lead for barely 10 minutes, total, in their first three games against the Winnipeg Jets. The Ducks won all three. In the fourth game, the Jets scored first again. Anaheim would come back and complete the sweep.
None of that was particularly surprising, and it is provided here simply as an example of the following: put a bunch of talented hockey players on the ice, and randomness will have about as much to do with the outcome as skill or heart or pick-your-intangible.