a) thinking with the bells - you exchanges dissonances. you map each other mental model and exploit it recursively - you force each other brain into manic mode
b) you self check the coherence of the data you received against your own mental model, you don't rely on other validation - see radical self honesty
c) coherence is how well it mixes with your current state and rules, kind of how ethereum validator will reject a corrupted block, same as something feels off when your partner lies to you