Antony Cummins

“When you infiltrate the enemy line and come to a naturally fortified place, use the appropriate tools to gain entrance successfully. To get into an impregnable castle with a high stone wall, a high fence, a barrier, or a castle not naturally fortified but well constructed, or even one fortified with water such as a river, it is essential for you to prepare yourself with useful tools before you embark on a shinobi mission. In addition, you need to use the appropriate weapons when you invade the enemy's residence. This chapter shows how you create these tools.”
― Antony Cummins, The Secret Traditions of the Shinobi: Hattori Hanzo's Shinobi Hiden and Other Ninja Scrolls

“The Skill of Au Awazu: If you go to another province and associate with the local people, it is quite likely that you will happen to see a spy of the province from time to time. You should not show that you have noticed what he is, but pretend to be unaware of it when associating with this local spy. You do this because if he realizes that you know who he is, he will feed you false information. However, if you two always associate with each other, and as it is your job to lie, it is often the case that either of you may unintentionally give away the truth. This is called au awazu [outwitting the enemy spy].”
― Antony Cummins, Secret Traditions of the Shinobi