It was a night of contrasting emotions for Vaughan, who made it 10 goals for the season before the end of September, had another strike incorrectly ruled out for offside and struck the crossbar from a late spot-kick.
Describing his in-form striker's mood after such an eventful evening, Robins said: "He's devastated; he beats himself up so he's really disappointed.
"He feels like he's let everybody down, it's the end of the world, but he'll soon be ok."
Paul Ince's visiting outfit could have returned to the Sky Bet Championship's summit had they won by two goals and they were halfway there thanks to Ricardo Fuller's cool opener after 27 minutes.
Yet no player in the top four divisions has now scored as often as Vaughan this term and while the offside flag prevented him moving into double figures in the first half, he soon had the Terriers level after the break.
Then with six minutes to go, a breakaway attack was ended by Blackpool's Angel Martinez tripping substitute Sean Scannell from behind in the area to earn a second yellow card, but Vaughan squandered the chance to make it 11 goals in as many games.
"He was very unlucky," added Robins.
"But we've got to take those chances if we're going to climb the table. It doesn't get us any closer to Blackpool and they're in the play-offs.
"Even though it's the early part of the season we've got to keep believing and keep picking points up."