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In the veda, the final /su of syaH स्यः is randomly elided before consonants.
This syaH स्यः (from /tyad- m + /su) means "he", same thing as /sas. So, there is elision here —
uta sya vAjI उत स्य वाजी
but not here —
yatra syo nipatet यत्र स्यो निपतेत्
etat;tados su-lopo '... < | 61133 syaz chandasi bahulam | > so 'ci lope cet pAda... |