In reply to coolbert:
> but a fall here could easily be terminal
That's the thing with scrambling, though, isn't it?
op: you can mess around with a shorter rope and climbing down part of it - but if you're wanting to abseil it, just take a rope you're sure is long enough.
Alternatives: climb down; or strongest member of the party lowers any others then climbs down (fine with a 30m scrambling rope); or do the ridge from north to south so this section can be climbed up instead.
And, of course, the option that should always be in the bag - turn back if unhappy.