During Jettisonable Emergency Escape Head Section abort mode, the head section of the rocket is separated and pulled away by OGB SAS (the escape tower) to safety away from the malfunctioning lower stages.
I didn't find at which point the separation occurs. In the video the flames of SAS completely obscure the craft. Neither the schematics nor the article on Wikipedia make it clear. Does the abort mode separate the Stage 3 (3-module Soyuz spacecraft) from Stage 2, or does the separation occur between the Reentry Module and the Service Module of the Soyuz spacecraft?