The Rolling Arm Crush is a very nice submission from the top north/south position. Thanks to Brian Yamasaki and Alvin Chan from CSW for putting this instructional together.
Once you have the north/south position with your opponent's arm locked up in a Kimura you can hit a Bicep Crush. This is a great alternative if you are having problems finishing the Kimura.
After you hit the roll you end up in the bottom position in a kind of reverse Duda. You want to lock up a Triangle with your legs to secure the position and lock your hands in a Gable Grip to finish the slicer.
BE CAREFUL with Bicep Slicers because your training partner is in danger of having their forearm broken.