It is Against the rules to PVP people in safe zones, However this glitch bypasses that and allows you to hit people, even in none pvp Zones.
Blauflamma Creates a Flame that doesn’t hurt you, also enables you to PVP people.
How to recreate
Step in said blauflamma:
Or: Hit whoever is standing in said Blauflamma
Hope you fix it soon, it could be bad in the wrong hands