I too wonder how they were at only 60' well beyond the end of the runway but 1/4 mile is 1300' which isn't really that far. If it was one of those jobs where the pilot tried to get airborne again because he thought he was running out of runway he could have been very low trying to get his speed up and cleaned up. These don't always turn out too well.
Off the top of my head I can think of an HS-125 in Minnesota and a Citation in Carslbad, CA within the past few years trying the same thing and both turning into disaster. I'm sure there are many others.