The Chicago Bears faced the Minnesota Vikings in a Week 4 matchup of NFC North rivals on Sunday. To no one's surprise, Khalil Mack sent Richard Sherman of the San Francisco 49ers and everyone else in the NFL a strong message.

The Bears won 16-6 and forced three fumbles, sacking Kirk Cousins six times.

1.5 of those sacks came from superstar pass rusher Khalil Mack. He also forced one of the fumbles.

Meanwhile, the San Francisco 49ers had a bye week in Week 4. Cornerback Richard Sherman apparently used that to watch some games.

He was impressed by Mack (just like the rest of the world) and took to Twitter to let his feelings known.

This is the perfect way to describe Mack really. Just say the moves he does are ridiculous. Other than that you can't really describe them because he simply shouldn't be able to do them.

Mack's absurd combination of size, speed, strength and athleticism are basically unmatched.

There's a reason him and Los Angeles Rams defensive tackle Aaron Donald are always put on a level higher than the rest of the NFL. They're untouchable.

Mack consistently shows he can get to the quarterback almost at will, and is one of the best in the business and knocking the ball out.

Through four games, Mack now has 4.5 sacks and four forced fumbles. He's actually averaging a forced fumble a game, that's insanity.

His elite skills have helped anchor one of the best defenses in football. A defense that has carried the Bears to a 3-1 start to the season.

Once again they look like a very real threat and should be taken seriously as Super Bowl contenders. With Mack instilling fear into quarterbacks, this team is far from finished. It's also no wonder Sherman is impressed. At this point, who isn't.