Silent is OK, like 2 fight on one and the fourth player is doing nothing but sitting in his corner glad that it is not him hammered this time. Well, apparently that fourth will be third soon and will be next if I may say so. Honour in this case would mean that 3 players cannot attack the one fourth all together. Certainly, one can attack 3 others, if he is insane enough.
However, the initial idea is that Kingreno understood and what I have got is that this siutation better be avoided because that is the reason we have received 2 starting civs to play with. Otherwise, there is little sense to play with 2 civs, it could have been just a normal 4-player no-AI game.