Here the response of the attorney representing the MMA guy from the GoFundMe page:
"My client would first like to state how much he appreciates the overwhelming support he has received from friends, family, and complete strangers as he deals with the aftermath of the events of February 13, 2021. As always, there is more to the story than what is depicted in the video. What is not shown is the original assault and battery suffered by Mr. Walker at the hands of Mr. Jones and his friend shortly before the captured footage. As can be seen, my client's nose and clothing were bloodied prior to the beginning of the video. Mr. Walker was legally justified in defending himself in this matter. As a result, Mr. Walker received several injuries including a torn bicep which will require surgery. We will not make any further comment until the conclusion of the investigation by the authorities."
It appears there was more happening from before this video started.