במהרי"ל אבל בשאשתו ובניו שואלין אותו אצ"ל מה נשתנה ומתחיל מיד עבדים היינו: עוד שם כשיגיע לדם ואש ותמרות עשן יזרוק באצבעו לחוץ וכן כשאומר דצ"ך עד"ש באח"ב בפרט ובכלל סך הכל י"ו פעמים וכן נהג מהר"ש ואמר שכן הוא בספר אבי"ה נגד י"ו פנים של חיות עכ"ל ונראה שרומזים כאן שחרבו של הקב"ה נקרא יוה"ך והוא מלאך ממונה על הנקמה כידוע למקובלים ונוהגים לזרוק מן הכוס באצבע לרמוז על מה שנאמר (שמות ח׳:ט״ו) אצבע אלהים הוא ודלא כמו שמצאתי כתוב בהגהת מנהגים דיש לזרוק בזרת קטן: In the Maharil (Our teacher, Rabbi Yaakov Levi Moelin): But if his wife and his children [already] ask him [relevant questions], there is no need to say Mah Nishtanah (How is it different). So one just begins from, "We were slaves." Also there: When one reaches, "Blood, Fires and Pillars of Smoke," he should remove [some of the wine in his cup] with his finger. And likewise when one says, "Datzach, Adash, Baachab" (the initials of the ten plagues), individually and as groups. The total is sixteen times. And this was the custom of our teacher Rabbi Shalom (of Neustadt). And he said that it is so in the book of Aviah (R. Eliezer ben Yoel HaLevi) - that it corresponds to the sixteen faces of the chayot (a type of angel). To here are his words. But it appears that it hints here to the sword of the Holy One, blessed be He, which is called, Yohakh (Yo has a numerical value of sixteen, and hakh means, strike). And that is [the name of] the angel appointed for vengeance, as is known to the Kabbalists. And it is customary to remove [wine] from the cup with the [fore]finger, to hint at that which is stated (Exodus 8:15), "This is the finger of God"; and not like I found written in the Hanhagat Minhagim, that one should sprinkle with the pinkie.