The FN 5.0 has fallen as low as 100-08 in after hours trading. Lenders might reprice for the worse, again, just for fun/to spite you.  The 10 yr is however holding steady near 3.82%-3.84%...this MSB selloff is based on the illiquid after hours trading environment, a complete lack of demand, and an aversion of  duration.

2s vs. 10s: 257.62

MBS QUOTES