In the 68th minute at Glanford Park, the Oxford loanee ran away celebrating Scunthorpe’s second goal of the night, which he is claiming as his own.
That goal put the Iron ahead in the match and McMahon was then involved in the next two goals.
Firstly, his chipped ball to Lee Novak was knocked down to George Thomas, who converted from close range, before James Perch ran onto his perfect set-piece to confirm the victory.
Speaking to iFollow Iron after the match, McMahon said: “Most importantly, we got the three points. It is a massive win.
“We needed a reaction after Saturday, but against Southend it was the perfect performance.
“We gave them an early lead, which was scrappy from us, but after that we were really good and thoroughly deserved it in the end. It was a good night for us.”
The Shrimpers took an early lead in the match through Simon Cox, who slotted the ball past Jak Alnwick inside the opening three minutes, but that didn’t stop the Iron from playing their game.
Impressed with the team’s character, McMahon said: “We know we have got good character and good players in our team.
“They got their goal, but it didn’t stop us doing what we do.
“We passed the ball around, had good passages of play and scored four good goals. When we are on the front foot and playing well, we are a match for anyone. We have got to keep doing that now.”
United got back into the match in the 23rd minute after Tom Pearce scored his first for the club.
His speculative effort from the left-wing flew all the way into the top right corner, but McMahon admitted the Iron needed a bit of good fortune.
He said: “Tom is saying he meant it, but it was probably a cross and it is flown in.
“The wind was blowing the ball everywhere and we needed that bit of luck to get back into it and we kicked on from there.”
After the break, McMahon then appeared to flick the ball into the net to give the Iron a one-goal advantage.
“I am claiming it as mine,” said McMahon.
“I don’t even know why I was in the box because I heard the gaffer (Stuart McCall) screaming for me to go back.
“I swapped with Funso (Ojo) and then gambled at the front post. I got across someone and went to do a Cruyff and felt something.
“As I have turned around, it is in the net so I ran off and celebrated like I had scored the winner.”
He continued: “I’m buzzing. Hopefully it sticks and it is definitely my goal, which I think it is.
“I am over the moon, but more importantly it is about the team winning.”
McMahon continued to be a threat going forward for the Iron and he was pleased that he contributed with the next two goals.
He said: “It is always nice to contribute at the other end, but it still pains me that we haven’t kept a clean sheet because I am a defender first and foremost.”
On Saturday, the Iron have a tough away test at promotion contenders Portsmouth, but it is a game the 32-year-old is very much looking forward to.
“We have got to prepare properly and go down there on Friday for a long trip,” said McMahon.
“It is a great place to go and play football. Their fans will be right behind them, but we go their full of confidence.”
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