Denjiro:—but Kin-san, you’re indeed a smart man!! Lord Yasuie’s drawing is telling us to put 2 lines on the belly of the viper that represents Habu Port. These 2 lines means to erase the belly of the viper, in order words, “erase the words”!!
You only told everyone about “two lines” because anyone who heard would’ve known that it means to erase the middle words of “ha bu mi na to”(Habu Port), which leaves us with hato(seawall).
—But, noticing that Orochi’s spy is near by, you purposely told those who are close the wrong answer: Tokage Port!!
And the spy would just pass that information on to Orochi!!
Kanjuro: Huh?!!