There's news about Malte. Apparently when he went in to calm down the situation the perpetrator recognized him as trans and threw transphobic insults towards him before punching. He's now in custody.

I fucking knew this was a transphobic attack. I'm so fucking angry

From the article linked in the German tweet (translated by Google translate, I'm gonna get my friend to check it later):

Malte C., also a CSD participant, got involved according to FOCUS online information. "Where's the problem?" The transman tried in vain to calm the situation down. According to the investigation, Nuradi A. and his companion are said to have freaked out further and insulted the twenty-something. According to the tenor, he wasn't a man at all because he was transsexual. Without further hesitation, the migrant from the Russian Federation struck Malte C. and immediately sent a second, targeted punch. The victim fell unconscious on the back of his head on the asphalt. The thug and his buddy then fled.

So we were fucking right. He was murdered for being a trans man. Malte was recognized as a trans man and he was killed for it. Never let this be forgotten; Malte C. was murdered for being a trans man defending other queer people.