Thanks Cap'n Bloggs, makes sense.
PS, just another thought - that procedure would have to be premised on an engine failure in a very small window (after being able to stop on the runway but before commencement of the 400 ft / DER turn, wouldn't it? I'd assume that once the turn was started you'd continue onto the north-eastery SID track rather than reverse and head out down the valley ... again, just asking.