When we talk about chokes we need to overcome our initial fear of the attack and remember what we have learned. For me Aikido is about remaining in control even when it seems like you are not and this is very important when dealing with chokes.
When looking at this specific choke, which is with one arm, you want to focus on weakest point. Which in this case is the hand/wrist, as it is farthest from the body. As the hand/wrist comes closer to the attackers body it becomes stronger and requires more strength to manipulate. Below are some videos that show this from a static perspective. We had some challenges so forgive the quality.