As the accused: get advice before questioning, clarify self-defence and sequence of events.
Bodily harm is an offence prosecuted ex officio. This means that the public prosecutor pursues it on its own initiative once it becomes aware, regardless of whether the victim wants this. Withdrawing the complaint does not automatically end the proceedings. From a legal perspective, it is therefore important to clarify the sequence of events and examine the evidence before the first questioning.
The question of self-defence or a mutual altercation often arises. Do not make a statement on the matter before you have obtained access to the file and sought advice. Secure your own evidence such as photos, medical certificates or witnesses.