Maybe doing zazen, you have an unpleasant feeling if other
people are next to you. In that case, you should understand why this is
so: it might be not your fault. In other words, you should understand who
those people are (in which way and why they influence you), and for this you should deny them, that is, just
continue to do zazen. If you do everything right, then as a result,
you'll have the feeling that they are your particular case, or, more
precisely, that the whole situation around is your particular case, unless a
thought occurs to you, which means you've failed to comprehend the situation.