A fourth needs to take notes and provide feedback to the team. Always respect and trust the ability of others to solve their own problems, given the non-judgmental support to do so. Be patient with the fact that this often seems like a slow process. Active listening is an essential skill for the recorder. Recorder needs to record exactly, paraphrase, turn a negative to a neutral or a positive statement with respect for speaker.
Accurate statement can sometimes forestall destructive comments.
Be comfortable with handing off back and forth. Every once in a while, you will lose it. Use stories and metaphor. Trust your intuition and awareness of other team members. Support other team members.