It looks like bond markets may be finding their line in the sand via a combination of rallying equities markets and a weaker 30yr bond auction.  The latter is doing the most recent damage, carrying Fannie 3.0s down a few ticks to 100-27. 

While that's only 2 ticks lower on the day, it's as many as 5 ticks lower than some lenders' rate sheet print times.  As such, negative reprices can't be ruled out for a few lenders. 

It would take several more ticks of weakness for the average lender to be at risk of repricing.