Ok.....still pi$$ed about this from last night.
I was rolling with one of my BJJ class buds, and managed to get north/south on him. I immediately go to short-base, and "shark-fin" under his right armpit to trap his arm. I roll him on his side, and then figure 4 his arm for the shoulder lock. I get one foot infront of his face to keep him from rolling, and proceed to hoist the arm and twist for the lock.
However, he manages to roll his body in the direction of the lock just enough to keep from tapping.
So, my question is, how do you prevent the guy from moving with the lock? Or was I applying it wrong? I ended up giving up on the Kimura, and going for something else - only to get tapped out.