Khalil Mack ‘practices like a rookie’ — and it resonates

Khalil Mack sits on the sideline Saturday at Soldier Field.During a joint practice against the Dolphins on Thursday, Khalil Mack faced off against Adam Shaheen, a former Bears tight end, in a blocking drill. After Mack beat him, the two jawed. Mack tore Shaheen to the ground. The two had to be separated.

Five days later, the Bears outside linebacker tried to claim he didn’t remember the exchange. Then he smiled.

“I like to have fun — and that’s my version of having fun,” Mack said after the Bears practiced Tuesday. “That’s my version of fun. We were just enjoying the times.”

Since Mack joined the Bears days before the 2018 opener, teammates and coaches have found ways to try to describe just…