Back end slider

[limax2]

Under heavy braking weight transfer puts a lot more weight on the front and less on the back. Hence easier to lock the back. In the wet you can't brake as hard without locking the front so less transfer and the rear can contribute a bit more in proportion to slowing down. But even in the wet the front is still doing most of the work. Anticipation and smoothness is the most important thing.
Well done for a good save though