So let's see... it was not actively raining, but it was misting and raining in local areas. The pavement was obviously slick and wet, but I noticed no visible puddles. The radius of the semicircle traveled by the turn was approximately 50', the turn was 90 degrees.
Off throttle from 40, down to about 37-38 at turn-in. Bring the wheel in for a fast turn, enough to feel body roll and lean on dry pavement. Turn sweeps maybe 30 degrees before the tires go, rear tires clearly moving right at a faster than than the front. I did not notice any TCS lights, but I was busy watching the grass off to the right edge, and keeping the wheel exactly in its position.
Turn ended right where it should, so it was really a small loss of traction. Definitely interesting, and makes me want to go try that some more... although someplace where there isn't dirt and grass nearby.