A Russian mixed martial arts fighter nicknamed “Mad Max” accidentally stabbed his sparring partner with an ax during a training session.

Maxim Novoselov was in the gym with Andrey Kynyazev, who is attempting to lose weight. Kynyazev was holding a hammer and a shield and was swinging it at Novoselov. The fighter was holding an ax and hitting the shield, a video released by Caters News Agency showed Thursday.

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At one point, Novoselov’s ax appears to pierce the shield and nick Kynyazev in the arm. Kynyazev then starts to bleed from his arm.

Fortunately, Kynyazev was only left with a scar from the session.

“That day me and Maxim wanted to shoot something special, but it went wrong,” Kynyazev said after the incident, according to The Daily Mail.

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“'It took four weeks to recover. Of course, I got to hospital where I had two stitches. It still hasn't recovered perfectly and I have a scar now.”