Very odd indeed.
I wonder how that happened? If you look at some of the better videos of tornadoes we've gotten to see lately, most of the wind, while going around in a circle, is in a relatively small place, going one direction, a few hundreds of feet further the circumference of the circle is showing the curve, but not within a few inches of the tree trunk, or even a ten or so span of the limbs. I guess if it were very near the edge of the winds sharp cut off and the branches were long enough, the wind like water flowing across a paddlewheel boat, might rotate the trunk as long as the roots held, and the whole thing can spin.
Strange.