The market mover in question is as follows:

RTRS EXCLUSIVE - WHITE HOUSE PLAN TO ROLL BACK CHINA TARIFFS FACES FIERCE INTERNAL OPPOSITION; NO FINAL DECISION MADE YET-SOURCES

That news hit the wires at 2:44pm ET and clearly resulted in a volume surge and noticeable moves in both stocks and bonds.  Until then, it looked like bonds had given up on their attempts to rally back this afternoon and were set to fizzle near the day's weakest levels.  

After the news, however, and stocks have given up most of their overnight gains.  Bonds have clawed back a far smaller percentage of their losses, but we'll take what we can get today.  10yr yields are now up "only" 8.6bps at 1.916.  Fannie 3.0 MBS are now down "only" 3/8ths of a point at 100-30 (100.94).