Question

how did the glum faced man take excuse to go away from the coach​

Answer 1

Answer:

he made an excuse of taking a packet of cigarette.

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Answer 2

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The glum faced man wants to smoke as he has not smoked the whole day. Mr Easton excuses himself from Miss Fairchild saying that he could not refuse the other man's request to smoke and he had to do his job of guarding the man.