Please take a look,at this sentence
I met him last summer and I asked him what he was doing over here and he said he'd come over to release a single and I thought.....
" He said he had come over here" is reported sppeech , but is it a backshift of "I came over" or did he answer "I had come over"
I think it is not a backshift as the man had arrived before the narrator met him Am I right ? If I am wrong let me know why