He has also lifted the lid on Ipswich striker Marcus Stewart having his jaw broken by Pablo Counago in a fiery five-a-side drill.
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Last year, talkSPORT's Gabby Agbonlahor first spoke on an incident between Richardson and Leandro Bacuna during a training session at Bodymoor Heath.
His fellow pundit has now given further details of the altercation, as well as a second bust-up involving 'nice guy' Richardson.
Speaking on talkSPORT Drive, Bent said: "We were both at Villa and I think Bacuna, them two were at it all training session so he kept pulling on Kieran's jumper.
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"Basically we were doing a session where it's one-v-one, you're on a team playing six-a-side but everyone is man to man.
"These two were going at it, he kept pulling on him and Kieran kept saying 'stop pulling me, stop pulling me'.
"It went on for about ten minutes and then we're attacking, next thing we hear is 'woah', all this commotion.
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"[I] Turn around and these two are in the half on their own just absolutely trying to punch the living daylights out of each other.
"They throw 'haymakers' and they get separated. Proper 'haymakers' so it was like 'wow', because that's not Kieran's nature.
"The following week, Bacuna was friends with [Karim] El-Ahmadi and the same thing happens.
"Kieran and El-Ahmadi, they start throwing punches at each other, like the same session, I think it was a tackle, Kieran gets up and them two go at it.
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"I think there was a little bit of needle because Bacuna and El-Ahmadi were friends.
"It was bizarre, in one week I saw Kieran have two punch-ups. For the first couple of days it's quite serious, then it filters out and you laugh about it."
Bent played for Ipswich prior to his spell at Villa having come through the academy at Portman Road.
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Despite being such a young age, he was able to get a taste of tension between two squad members on the training pitch.
"Another one when I was at Ipswich, it wasn't even really a dust-up," he said.
"Basically we were playing five-a-side. Marcus Stuart and Pablo Counago are at each other, like kicking each other, holding each other.
"Both centre-forwards and it was getting a bit naughty, some of the challenges you were going 'wow', and anyway the ball bounced up in the air and Pablo just goes to volley the ball.
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"As he goes to volley the ball, Stewart heads it and Pablo just volleys him straight in his jaw, bang!
"You wouldn't say it was on purpose but his leg shouldn't have been where it was, completely shattered his jaw.
"Smacked, broke up his jaw. We lost him for about two months. You know what I can remember more than anything? The crack."
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