However, the Knights' 7-foot-6 giant believes he's ready to meet his 6-foot-7, 285-pound counterpart at the rim to shut him down.
"It's very hard (to dunk on me)," Fall told NCAA.com's Andy Katz after beating VCU 73-58 in Round 1 of the NCAA Tournament on Friday. "I mean, I won't allow it. I won't allow it. I won't allow him putting me on one of his highlight tapes."
Williamson's hulking size makes it all the more remarkable that he's the most explosive college athlete in the nation. Despite being at a height disadvantage against opposing big men, the freshman star is shooting 76.1 percent on 10.7 attempts inside the arc this season.
Though Fall is confident that the Knights will advance to their first Sweet 16 in school history, he understands the stiff test ahead of him.
"He's someone, pretty much, we've never seen with his size and athleticism. He's so quick," Fall said. "But the coaches are going to have a great game plan for us, especially coach (Johnny) Dawkins. I feel like, because he played for Duke, he's going to have to help us out a lot."
VCU had no answer for Fall's tall frame in the opening round as the big man finished with 13 points, 18 rebounds, and five blocks in 28 minutes.
Meanwhile, Williamson continued to display why he's the favorite to win Naismith College Player of the Year, finishing with 25 points on 16 shots in an 85-62 win over North Dakota State.