The first 15 seconds
Radio: location, number of people involved, weapons yes/no, emergency services needed. Approach with a colleague, not alone.
The physical separation
One guard per combatant, angled approach, verbal commands to disengage. Move each away in opposite directions — never park them next to each other.
After the noise stops
Immediate medical assessment (both parties and any bystander), identify witnesses, preserve CCTV timestamps, secure any dropped items as evidence, statement to attending police.