The best facilitator I ever knew could walk up to a small group of people (many times I was in one of these groups), start a conversation about something trivial, ask a few questions to keep the dialogue going, and then leave.
It wasn’t until after he left the company we worked for that his brilliance surfaced. You see, every time he left, I realized he had just taught something. He was teaching me how to be a facilitator. Guy was the boss. I was a big time rookie.