[Once she's near enough Frost uses a wind to kick up the snow on the log, sending it everywhere. Once it settles again the little hollow should be visible enough--though she may need to look closely to find what's in it. Regardless, in that hollow would be a good store of wood; certainly more than she now had in arm.

[The breeze dies to nothing more than the faintest trace. This is where he meant to lead her.]