So, let's continue to clarify the facts. I went and found the video of the incident, and you're stretching the truth to the point of being disingenuous.
Here's the video (obvious warning, it has footage of Rittenhouse shooting his victims) https://files.catbox.moe/ayaw6u.mp4
Considering he never even swings it at Rittenhouse, and merely has it in his hand when he tries to stop him running away, that's a real stretch to say he's "trying to beat him to death". I won't argue that trying to stop an armed person by jumping them is a bad idea, but that's not what you said.