dstiles - 9:12 pm on Sep 9, 2012 (gmt 0)
I block a LOT of /24 to /16 and all increments inbetween. It's either that or block "real" users within larger ranges.
Could there have been a "page update" checker in operation, either within that IP range or on a DSL range used by the server owner? Since there seems to be a "link juice factory" on the IP I would say that's a possibility, perhaps checking for their customers?
I would not expect bing or any other reputable SE to tell-tale directly, although the offender may be periodically scraping SEs for such things.
Timing may be coincidental? Perhaps, say, a 4-hour cycle might do the job and a page-checker visit (or SE scrape) coincided with your update?