There is a huge difference between a sanctioned boxing match, a sparring match, and an illegal boxing match.
If the contract was for a boxing match, it gets expensive, requiring medical screenings, ring side doctors, license etc. The big reason so many opening matches will exist on fight card is to try and save money.
Sparring sessions, obvious the conditions are different. You don't have the necessary legal requirements, under the expectation that the participants are not actually fighting Lowtax effectively acts like the bout went down like the sparring scene in "Million Dollar Baby" where numerous people would be facing criminal charges if it occurred in real life, especially if it was recorded like the Uwe sessions.
Correct me if I am wrong, Lowtax never went to the doctor after this sparring session right?
If Uwe went into that session and people suspected he was headhunting, not only would the German authorities go after him, he would have been blacklisted from boxing gyms like that Charlie Z idiot.