Incident at the queue

S:Sir, I think you should step aside from the line.
M: Why? What did I do?
S: Sir, can you just please cooperate Sir? Let's not make a scene here. Would you please step aside and let the others proceed?
M: No, not if you don't tell me what is this about.
S: Sir, I am going to say this one more time, can you please step out of the line?
M: I am going to say this one last time! Tell me what this is about or let me through. You're wasting my time, I'm going to be late for the boarding!
S: Sir, I'm sorry to inform you this, but there won't be any boarding for you I'm afraid.
M: What? What do you mean? This is my boarding pass.
S: Sir please, kindly step out of the line.
M: Not until you tell me why!
Granny at the back of M: This is going nowhere...