+1

Hello.

Let's imagine I report a shop robbery to the police or just describe to my friend what I saw yesterday:

A/the shop assistant raised the alarm when he saw a gun in a/the man's pocket.

Is it correct to use the indefinite article before 'shop' and 'man' as it is first mention?

+1

A/the shop assistant raised the alarm when he saw a gun in the man's pocket.

Here we have a specific incident, and by implication, a particular suspect. I would use the definite article before "man." Compare with this sentence where the situation is hypothetical.

Shop assistants should raise an alarm if they see a gun in a man's pocket.
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Yes correct
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 AlpheccaStars's reply was promoted to an answer.

Thanks, AlpheccaStars. Your answer is so clear and logical. I like it very much:)