When you lay one down you are giving up. Your brakes are only good if the bike is upright and you can't steer away from something for the same reason. Ride that puppy out to the bloody end. Fight it, lean it, hold that front brake hard but don't just give up. I suspect you were only using the rear brake anyway. Not a lot of stopping power in an emergency stop there. Use both brakes but much more front than rear.