whew, that sounded like a sudden hairy situation u had there, alls well that ends well.
3 years ago on my 1969 cb750 that i had just rebuilt, i was cruising down a 2 lane hwy at 50 mph when the rear wheel locked-up w/o warning. i skided to a halt in the middle of the lane, and because wheel was locked, had to use all my strength to safely get the heck outa the road, had to drag it sideways, not ez, and it took more time than i was comfortable. luckily, nobody was behind me, and cars fly on that road. turns out there was a missing internal spacer for the axle, and it was my negligence in leaving it out.