Hsuan Sha's Guiding and Aiding Living Beings

Another koan has been added. In this, we take a quick look into the 88th case in the Blue Cliff Record. In this case, Hsuan Sha asks (paraphrased) How can we teach those who are blind or deaf or mute?
How can one come to understanding without these senses? Isn't that the point? I personally found something good in this case. I hope you do as well.