बौधायन श्रौतसूत्रम् (कृष्ण यजुर्वेद तैत्तिरीय शाखा - सम्पूर्ण प्रश्न एवं श्रौत-याग कल्प सटीक)

" (sutra ends) ' (Caland's sutra separator) "अथाय सात्यदूतानां हविर्भिर्यजते" (next sutra begins) In sandhi: पशुबन्धस्तु + अथाय = पशुबन्धस्त्वथाय! And Caland inserted his sutra separator ' inside the sandhi: "स्त्व'थाय" or "स्त्व॑थाय"! THAT IS GENIUS! That explains EVERYTHING:

1. Why line 14 ends with "पशुबन्ध-"
2. Why line 15 has "स्त्व" + ' + "थाय"!
3. Because the sandhi is "पशुबन्धस्तु" + "अथाय" = "पशुबन्धस्त्वथाय", but Caland marks the sutra boundary with ', so it is printed as: स्त्व'थाय or स्त्व॑थाय! Let's look at it: YES, it is स्त्व with ' and then थाय! Wait, let's check if the mark is a single quote: Yes, it is the same single quote ' that Caland puts everywhere to mark the end of a sutra! Look at line 1: इत्येके ' समानं Line 1: ऽवभृथ ' उदय- Line 2: उपाकरोति ' तस्यै Line 5: `यान्तः '