Street medics provide medical first aid to the participants of demonstrations, often having to stay close to clashes to case their help is needed. During G20 protests some became victims themselves, as the legal aid reports.
In a press release the legal aid (Ermittlungsausschuss) mentions (Press release #14):
Tending to the injured
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Welcome to Hell demonstration: Street medics tend to an injured person at the Hafenstrasse promenade while around them other protesters still climb over the wall. By Risande Tyskal
Manifestation at the Fischmarkt
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"There was a good atmosphere at the St. Pauli Fischmarkt, when thousands of protestors met there early on Thursday evening under the slogan "G20 Welcome to Hell". Manifestation and a music programm brought about 10.000 people to the Fischmarkt - about 7000 of them later lined up for the demonstration."
“There was hitting and kicking, mainly by the police”: Summary of a witness report about the escalation of the Welcome to Hell demonstration on 6 July 2017