Sheffield United had two players sent off but were still able to snatch a point at struggling Scunthorpe.
Skipper Michael Doyle was dismissed for his challenge on Mike Grella and midfielder Ryan Flynn also saw red for a high tackle on Christian Ribeiro.
A header from debutant Leon Clarke looked to be enough for Scunthorpe to claim their first win of the season.
But the Blades levelled when Neill Collins, who had earlier hit a post, nodded in Tony McMahon's free-kick.
VIEW FROM THE DRESSING ROOM
Scunthorpe United manager Alan Knill told BBC Radio Humberside:
"I thought we were pretty good for the whole game, irrelevant of what we had on the pitch.
"The attitude was really good, and the new signings [Leon Clarke and Karl Hawley] made a difference.
"I am frustrated but there's plenty of positives to take. We haven't lost, that's the most important thing.
"After four losses on the trot, you don't want five. We've got a point on the board and we've got a squad now that's capable of competing."
Sheffield United manager Danny Wilson told BBC Radio Sheffield:
"When you get a performance like that from an official, I can't understand why I'm not supposed to comment on that.
"It was a terrible game from his [the referee's] perspective. He sent Michael Doyle off for an alleged stamp and he's nowhere near the boy. Even before that, he gave some strange decisions for both teams.
"If anything, [Ryan Flynn's red card] is a booking. They've both gone for the ball.
"There's two coming together at pace. There's a ball there to be won and they're going hell for leather for it."