Awarded for those who engage in exceptional acts of bravery while in the line of duty.
Here's what happens: it's not rare some of us go way beyond the standard procedure to help someone out, and the possibility to go into chat is awesome. It prevents a long list of comments in the main page of the thread and adds more flexibility to the communication (allowing to copy/paste code and stuff more easily).
The thing is that sometimes new users come very desperate to Stackoveflow looking for help, and with the lack of proper English, they end up getting impacient and frustrated very fast, and that can lead to loosing control over themselves making things get ugly, with offensive posts being fired for no reason (the offensive posts in this reference were already flagged and removed).
That's where the Bravery badge comes in. The idea is to award users who went beyond their duty trying to help others and got stabbed while doing it.
Technically speaking, we could award the Bravery badge when a user moved the discussion to a chat, and then flagged at least one of the OP's message as offensive.
I'm accepting suggestions as for the class of the badge (silver/bronze).