The shutter speed rule of thumb states:
You can get a sharp shot when you shoot at a shutter speed faster than the inverse of your focal length.
Since my focal length was 85mm I should be able to get a sharp shot only if my shutter speed is faster than 1/85 sec.
Haha, my shutter speed was 1/20 sec, slower than 1/85 sec. I beat the odds, I got a sharp shot!by