Try substituting a particular action like "hit." It becomes easier to imagine: > If everyone hits everyone who hits them, then everyone is hit by everyone whom

Try substituting a particular action like "hit." It becomes easier to imagine: > If everyone hits everyone who hits them, then everyone is hit by everyone whom they hit. Or: "If everyone hits back, then everyone gets hit back." The other example is the same, but with propositions instead of people and "bearing" instead of hitting/unspecified human actions.