As for St Mirren, it was a bit of a headscratcher. After a brave 90 minutes against Celtic in the Scottish Cup semi-final last weekend, they crumbled in extra time and it would have been no surprise to see a downhearted, tired display.
That wasn't the case - for the first 45 minutes. They had 17 shots throughout, in comparison with Livingston's four.
Declan John bombed forward on the left. Balls were hung up to the back post for Mandron, Ayunga and King to attack. It seemed like a matter of time, but they couldn't find a way past Prior.
At the back, debutant goalkeeper Sinclair - signed on an emergency loan from St Johnstone following injuries to Shamal George and Ryan Mullen - didn't have much to do at all.
But given the slightly perilous position they now find themselves in, it would be a surprise to see him usurped by 17-year-old Grant Tamosevicius.
The teenager signed a new contract after a solid deputising performance at Hampden last week, but as interim boss Craig McLeish said, the youngster needs protected and chucking him into a relegation scrap would be unfair.