1. Do not side anyone.
2. Listen to everyone's side of the story.
3. Do not, under any circumstances, become agressive.
4. Calm everyone down. Everyone.
5. Call on your fellow bystanders.
6. Do not overreact.
7. Do not add fuel to the fire.
8. Explain your views clearly, and humbly.
9. Always tell the truth.
10. If all else fails, GTFO of there immediately or you'll be dragged into the mess.