Working Google map
Early in my hiking with the group we had done a hike in this area which had impressed me because, after climbing a long ridge we came to the top of what would seem to be one of those knolls that one keeps getting to on the way up ridges on the way to the Koʻolau summit, only to drop a ways and then climb to the next knoll. But we came to a knoll, open enough for the whole group (typically 10 to 15 in those days) to sit and have lunch, and the Ko`olau summit side plunged straight down for what seemed to me hundreds of feet. After lunch we hiked down another ridge which met there in an acute angle.

In recent years I have kept expecting to reach that same hilltop on one of our hikes, but never did, and I wondered where it was. Thanks to electing to do the double loop this day, I now know. It's at the lower left end of the loop, where (if you check with a topo map, such as the "USGS + Relief (Cal Topo)" available in the map selecter upper right) true to my memory there is a very steep drop of about 800 feet.