Well first of all here goes the PNR entry
/blog/post/659693
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Additionally I had filed a TDR under similar conditions 3 months ago in oct 2012, where in a 2 pax ticket one was confirmed via HO and other remained in WL, I got full refund minus Rs 21 per pax. Class was 3A in same train.
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Now in current case issue is same, one pax got confirmed via HO, while other moved to RAC, so going by the refund rules I was guessing if RAC and WL are treated in same bucket or not.
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There is no clear cut mention of RAC pax in refund rules for mixed status tickets in IR site.