I was coming down my driveway to head out on a ride when I used backpressure to slow myself. The cog suddenly loosened, but luckily tightened against the lockring. I was trying to slow down when that slowing stopped, not much, maybe a metre past the stopping point I had envisaged. I have a BMX brake next to the stem and while I was able to hit it, I wasn't quick enough to prevent the 'surge'. And this wasn't even a suicide hub. A suicide might have been 2, maybe 3 metres before I could hit the brake.

The surge is like applying the brake, then taking it off for a second. Its a fraction of a second of your bike is 'out of control'. Personally I like control at all times, thats why I ride fix.