Just after the hour, substitute Dwight McNeil robbed Sam Byram of possession and threaded over a glorious centre, but as the entire stadium expected the net to bulge, the Ivory Coast international held his head in his hands as the ball skewed off his right foot and went wide.
That would have levelled matters at Carrow Road, in a game the Clarets ideally needed to win, but ended up losing 2-0, to leave them four points adrift of safety, with eight games to play.
Almost everything Cornet has touched this season, since his summer move from Lyon, has turned to gold, and this was a rare moment where he couldn’t provide a killer finish.
And, asked whether Cornet would need picking up, Dyche said: “No, I don’t think so.
"I always get on players when they are not in the right area, and he is in the right area.
"He has shown that he will get in the right areas and score goals.
"I would be more annoyed if Dwight put in a fantastic ball like that and he wasn’t there.”
Cornet had been the hero on Wednesday night, firing in his seventh goal of the season five minutes from time to seal a 3-2 win over Everton, and Dyche mused: “That is the challenge of football and where the focus is clear – the last one doesn’t owe you the next one.”