It happens from time to time... and after many efforts to control what happens in small groups, I rely on time to fix the problem + immediate evaluation of the experience among group members. It can be very unfamiliar to ask for help and to give help in different form. TRIZ helps group members get better at both. The person who ranted will very likely notice what is a good consult WHEN they get one. You might want to tag Helping Heuristics onto the end of your next session with this group. This can help expand the repertoire of helping behaviors.
We recently used Troika Consulting in an MS Teams meeting with 20 participants. None of them had ever done it before. Feedback was generally positive, but one told me this: "I was the client first. I explained my problem. Then one of the consultants responded that he has the same problem and ranted about it for 5 minutes."
Of course, this breaks the structure and the client got nothing out of it. I wonder if I, as moderator, could have helped somehow. I explained the structure in advance with a slide and provided that slide via chat, so everybody had it at hand. I doubt it was a knowledge problem.
Troika relies on the 3-person group to moderate themselves during the consulting. Any tips how to help them from the outside/as moderator? Otherwise we can only repeat it until everybody is experienced enough with it.