Please excuse me, I'm new to this (working applictions/bunkai from forms/hyung/kata).
I was reading through Iain's Book, "Understanding Kata & Bunkai, Karate's Grappling Methods" and on page 44 Iain suggests a application for a throw in Rohai. The front foot sweeps back into a crane stance and the arms sweep back at the same time. We see this in a lot of different places, usually with varrying arm motions. In particular, a sequence from Chil Sung Sam Ro stood out to me. I have found a video on youtube and looped the relevant section below (0:46 to 0:56). There are two interesting things in this sequence:
1. The "double block" before the sweep/throw. I believe this is a strike or a brace, perhaps an entrance into the throw. The upper arm could be a strike to the face and the lower arm is in place to receive or grab the leg.
2. The forward push afterwards. I believe this is a "backup" to the throw. I've heard this called a staff block or oher such strangeness; I really think this is a push. Should the throw not work, follow through by pushing your weight, and your opponent, forward.
I don't have a training partner at the moment so I can't really work this out in other than on my own but I wanted to see what you all thought.