[CQ-Contest] Sending the other guys call

[Tree]

Here I am in the ARRL 160 - about an hour before sunset.  I am CQing 
and a station answers me...  right in the middle of my passband...

They are in the W8 call area.  They come back after a slight delay
(maybe a half second) and send their exchange - then ask me for my 
QTH.  I send it a few times - and then hear nothing....  

Did they get it?

Were they calling me?  

Do I leave it in the log and possibly get a NIL?  Do I take it out and
remove a good QSO - and give him a NIL?

If they had just sent my call once - I would have known that they are 
working me.  

Argh.

73 Tree N6TR/7