Dear OP, I would advise you to use a quote tag for properly quoting or citing a post, if not your post might be said to be plagiarized. Though I can see the source but please take note of this.
You can learn how to make quoted posts here:
https://bitcointalk.org/index.php?topic=5227254.0
The one who should learn about plagiarism is you, not him. He was already write the original source below his post.
There's no specific rule you must use quote tag in order to prevent from plagiarism.