Davies' goal came in the 96th minute, despite the fact that only 5 minutes off time were added, and many were confused as to why referee Jon Moss hadn't blown the whistle.
However, for Hughes, it wasn't just that that Moss got wrong. "Unfortunately the officials towards the end of the game haven't covered themselves in glory if we are honest," the Saints boss said after the game.
"Nathan Redmond is in the corner and has done a fantastic job to nick the ball off the toes of their centre-half. The assistant referee is about two or three yards away and clearly sees it isn't a foul but Jon Moss, as he usually is, about 30 yards behind play, decided to give a free-kick."
"To compound that situation he allows them to take it from the wrong position, 10 to 15 yards ahead, and at that point we are still arguing about whether it should have been a free run on goal for ourselves.
"It was difficult to get our shape back, we'd lost a man to a sending-off, and in the end, with hindsight, as a consequence of being down to 10 men we got tired and made the wrong decisions.
Hughes continued with his criticism of Moss, saying that it's not a one-off occasion.
"Before games we shouldn't, as management teams, worry about which referees we have got, but it happens too often and that's what everyone does: you worry about the referees being strong enough, worry about them playing a direct part in getting key decisions correct or incorrect."
"You shouldn't have to worry about it. They should be the best and unfortunately they are not."