Brock Lesnar is not Bob Sapp. He isn't known as a giant man who is actually a giant teddy bear. No, Lesnar is a giant man whose physical dominance and athletic prowess has only served to make him anything but a "cuddly giant."
He picked up a reputation during his time trying out for the NFL's Minnesota Vikings as a loose cannon after a general unwillingness to go at anything less than full speed and breaking some standard rules such as not crushing quarterbacks during drills, something he did to the Kansas City Chiefs' Damon Huard.
So that this story, told by Nik Lentz to MMA Mania's Verbal Submission podcast, not all that surprising if true:
"I did roll with him one time and number one, it was really gross because the dude sweats like a ridiculous amount so I was just covered in Brock Lesnar sweat, like just dripping in his own sweat but then he was kinda messing around and I jumped on a guillotine and I wound up eventually tapping him out and then he actually got kinda angry and the next time that we started, he just picked me up above his head WWE-style and like threw me across the room so that was the end of my training with Brock. I got him one time. I jumped on the guillotine because he wasn't ready for it and I choked him out and then after that I got thrown across the room."LINK