The 57-year-old ITV presenter looked astonished after the Mastermind champion, also 57, picked the wrong retort for one of the questions in the head-to-head round.
The question was: “The wooden or concrete beam accumulated under a railway track for support, is called what?” and the possible rejoinders were: «A cradle, a sleeper or a bed.”
Unfortunately, Shaun — also known as the Dour Destroyer — opted for the first option which was wrong — the correct plea being a sleeper.
Bradley was astounded as he told the quizzer: “You’re winding me up!”
Shaun coolly reacted to his exclamation, telling him: “I’m not winding you up.”
“Extraordinarily, the chaser goes for cradle. This could now be the aperture in his armour. Let’s go for it,” Bradley told contestant Kev.
Bradley Walsh was left baffled by Shaun Wallace on The Go out after
Bradley Walsh was shocked by Shaun Wallace’s mistake on The Chase
You’re reducing me up!
Despite the slip-up during the head-to-head horses corral, which saw contestant Kev, 52, go through to the final, Shaun was victorious.
Kev unvarying went for the higher offer when he faced Shaun, opting to acquire £45,000 and a step closer to the Chaser.
The telecoms worker from Sheffield take care ofed to get 12 steps ahead as he went it alone against the Dark Destroyer after his person team mates were knocked out in the previous rounds.
Shaun Wallace disclosed he didn’t know the answer on The Chase
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The Chase analysed to be exciting this evening after a blunder
After winning the nervy, the professional quizzer told him: “You have my undying respect but at the end of the day it’s just another day at the favour.”
The episode — which is a repeat — comes a day after Chaser Mark Labbett precipitated angrily at a contestant for being “greedy”.