When the rear brake locks up continue to look straight ahead at the horizon. Do NOT look down or side to side. It might fishtail a little bit but nothing big.
The bese thing you can do is practice your emergency braking in a large, empty lot. Just front brake, just rear brake, and then both. You can even put a shirt down as your starting point to see how long it takes in all 3 scenarios. Some will say don't use the back brake but you will see it helps. Practice practice practice.
Oh yeah, next time post this in the riding tips section unless you actually go down.
