reflog/show question

["Geoff Russell" <geoffrey.russell@gmail.com>]

     git show HEAD@{"3 minutes ago"}

works as I expect, but

     git show HEAD@{"3 minutes ago"}:data/node/node.data

gives me a message:

       warning: Log for 'HEAD' only goes back to Mon, 28 Apr 2008
10:18:37 +0930.
       fatal: ambiguous argument
'HEAD@{3.minutes.ago}:data/node/node.newds1': unknown revision or path
not in the working tree.
       Use '--' to separate paths from revisions

However,

     git show HEAD@{2}:data/node/node.data

shows me the file as it was 3 minutes ago.

I'm using 1.5.4.rc4

Cheers,

Geoff Russell