Aaron Hernandez sits in the courtroom of the Attleboro District Court during his hearing on August 22, 2013 in North Attleboro, Massachusetts

Aaron Hernandez sits in the courtroom of the Attleboro District Court during his hearing on August 22, 2013 in North Attleboro, Massachusetts

*Poor guy didn’t stand a chance!

Aaron Hernandez beat up another inmate, but only the guy was in handcuffs.

Hernandez clearly didn’t care, as he attacked the inmate who was talking stuff.

He was going on a walk at Bristol County Jail and was allowed to NOT wear handcuffs.

That was definitely a big mistake since after another inmate started talking trash, he snapped!

Sources told TMZ the attack was brutal against the inmate who could hardly defend himself with his handcuffs on.

Bristol County Sheriff Thomas Hodgson said the fight was only less than a minute — plenty of time for Hernandez to do some damage.

“It was very brief. The officers were right there and it was stopped within seconds, maybe a minute,” Hodgson said.

There’s no known lead as to what was said to Hernandez to make him snap or if he has been enemies in the past with the inmate.

“We don’t know what, if any, relationship there was or has been at any point, either here or anywhere else,” Hodgson said.

But he’s investigating the fight and why the men were in the hallway where it happened at the same time.

The former New England Patriots tight end is being held without bail due to pleading guilty to murdering Odin Lloyd — who was dating the sister of Hernandez’s fiancee.