[CQ-Contest] He sends my callsign

[Steve <steveac@charter.net>]

A lot of my contest QSO's this past weekend went like this:
1. I send CQ SS
2. He sends his callsign
3. I send his callsign
4. I send exchange
5. He sends my callsign
6. He sends exchange

What is the purpose of line 5?

In those instances when I answered a CQ, I did not include line 5. 
Should I have?

Thanks.

Steve K8JQ
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