WD:
Checked my video, memory plays tricks sometimes. The incident I mentioned was at Mildenhall in '97, certainly no SR-71 there but the B1 did not roll. He made a low pass and zoom climbed then rolled right until he was inverted and the flew like that for 5 seconds (I counted, sad or what?
) then rolled left to level flight, so it sounds like the same thing you described.