American rapper Travis Scott was left stunned after witnessing a brutal knockdown while attending his first Power Slap event last week.

Power Slap is a fighting promotion company owned by UFC president Dana White which puts on contests where competitors take turns to slap each other in the face.

Despite its brutal nature, it has grown in popularity over the past year and has seen famous names such as Tom Brady and Charles Barkley attend events.

Scott was in the audience for last Friday's Power Slap 6 show in Las Vegas ahead of the Super Bowl in the same city and sat next to White in the front row.

He did not sit down for long, though, as he jumped to his feet when one particular smack sent a female athlete crashing to the mat.

The camera panned around to get Scott's reaction, and he was visibly shaken by what he had just witnessed.

Scott - who has had four No1 hits on the US Billboard Hot 100 chart - was seen looking around the arena as he struggled to comprehend what had just occurred.

His reaction was very different from White's, who appeared to be smiling after the blow, while other audience members applauded.

Power Slap has received criticism since its inception, with one expert slamming White for allowing defenseless fighters to take heavy blows to the head, risking serious injury.

There have also been complaints about the money being paid to fighters after it was revealed when the show started that competitors were only receiving £3,200 per bout if they won.

However, White has defended the brand, previously claiming that safety will be improved, while also stating that the pay is similar to what it was when the UFC first started.

His events have still managed to attract some household names, but whether Scott will be back for another show remains to be seen.