The example is not a BFL 5000 feet and an ASDA of 10,000 feet, the example is BFL = ASDR, no overrun or stopway, just a cliff, down into a gorge. FAR 91 or FAR 135. no difference, the physics are the same.
How do you pass the end of BFL at 50 knots, at that point you should either be stopped (ZERO Knots) or at V2 at 35 feet, V2 better exceed 50 knots!
GF