Bradford boss Peter Taylor was left rueing the decision he felt ultimately cost his side dear in the 1-0 defeat at Wycombe.
Kevin Betsy netted the only goal with just 10 minutes remaining after the Bantams saw Tommy Doherty go for an early bath having shoved Gareth Ainsworth in the face.
The Chairboys made their numerical advantage count when Bradford stopped playing after Stuart Beavon was tripped in their half with the referee's assistant flagging for a free-kick.
However, as City stopped, Matt Bloomfield surged into the penalty area, and despite being tripped by Lenny Pidgeley, Betsy was on hand to tap in the loose ball.
Taylor said: "To me I saw the linesman put the flag up so for me I thought he was giving us a foul and all of a sudden he doesn't. I was quietly happy even seeing the play go on because I saw the flag up. If they're carrying on why would the official keep his flag up so to me he's given that decision to us.
"I don't think the officials have had a great day to be honest with you. I think both teams have done really well and I was very pleased with our performance but I'm disappointed with lots of things that went on out there."