Falling and Railings

If a fighter becomes prone with 1/2" of an edge
take Initative test if passed nothing happens
if fails or natural 1 fighter falls and takes a hit
if edge has railing +1 to initative test
3-5" Str 3 AP- D1
6-7" Str 5 AP-1 D1
8-9" Str 7 AP-2 D2
10" Str 9 AP-3 D3