When is the addition of "and His forgiveness" said in the greeting?

The Shaykh : When you greet me on the phone first: "Peace be upon you, and Allah's mercy and blessings, and His forgiveness," I have given you a lecture on the phone. I told you: The addition of "and His forgiveness" is prescribed only for the one who responds to a complete greeting. The complete greeting, to which no addition is permissible, is to say first: "Peace be upon you, and Allah's mercy and blessings." Adding to this is a religious innovation. As the responder, you apply His saying—Exalted is He: You add: "and His forgiveness." You add it. As for the beginning, the end of the greeting is: "and blessings." Now, we are commanded as it came in the hadith: . The Companions paid attention and said: "What is this, O Messenger of Allah?" The first one entered and said so, the second, he said: This is the limit of the greeting and the completion of the greeting for the one who initiates it. As for the responder, if the initiator completed the greeting, he adds: "and His forgiveness." But if he did not complete the greeting and said: "Peace be upon you," you may say: "And upon you peace, and Allah's mercy and blessings." He said: "Peace be upon you and Allah's mercy," you may say: "and blessings," do not add. He said: "Peace be upon you, and Allah's mercy and blessings," you say: "and His forgiveness."
Is it clear?
The student : Is that clear?

The Shaykh : So, note it down so you do not forget.
The student : May Allah reward you with good. May Allah bless you.

The Shaykh : And may Allah protect you, if Allah wills.