Gerard of Cremona, and later H.C. Agrippa, claimed that the Dragon's Tail in the ascending sign gives chaos to the interpretation of the chart, and therefore any horary chart with the SN in the ascending sign is untrustworthy for reliable delineation and = a "stricture" against judgement.
I have found this to be true. In standard horary, the SN in the querent's signifying house (the 1st) is looked upon as an ill omen; the oldtime Ottoman astrology (which I call the Ankara horary tradition) took the SN in the 1st house to always mean a no answer to the question; however, I cannot go along with this-because I've seen yes results when the indications in the chart were decidedly for a no, just as I have seen no (negative) results when the indications in the chart seemed decidedly yes, IF the SN were in the ascending sign in those charts. That is why I do not attempt to delineate horaries IF the Dragon's Tail posits the ascending sign (which in whole sign = the first house) in that chart.
What in the hell system do I use in horary? Primarily the Ottoman astrology approach (Ankara), much of which can be found in early Islamic horary authors such as Al-kindi, Abu Mashar, Al-Biruni, Ibn Ezra, Thabit ibn Qurra; but modified by Gerard of Cremona, Bonatti (somewhat), and my own insights. That is why at the head of all my horary delineations here on AW I post a specific disclaimer about what I am presenting, so that newbies and students do NOT get confused and misunderstand that what they are about to read is standard (lillyesque) horary. My approach to horary delineation has offended some of our friends here on AW, but I am not advocating my approach, nor trying to convince anyone about anything! Its just the way I do it, which seems to work well for me!