At the end of what? Do you mean After a minute or two Felix said to Adam? No, it is not necessary, since the fact that he is speaking to Adam is made clear when he speaks his name.
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Tenacious LearnerHe said he did his job and (he) didn’t ask questions (to Adam).1. You have omitted some of the text you are asking about. You haven't included anything about Felix saying he did his job.
ElanguestAt the end of what?Hi,
CalifJimYou have omitted some of the text you are asking about. You haven't included anything about Felix saying he did his job.Hi Jim,
ElanguestI see CalifJim understood you better.Hi,
Tenacious LearnerIs the blue part necessary or optional?It is neither necessary nor optional. It is forbidden!
Tenacious LearnerThat's due to he knowsThat's [because / due to the fact that] he knows ...