Out of curiosity, why do we not do the below? Tanking in edge of room makes 12 yard rule difficult?
If you have knockback effects, like a Shaman Thunderstorm or Moonkin Typhoon, Blood Beasts can be knocked off the edge of the platform where Saurfang is tanked. This negates the need to take DPS off Saurfang as knocking them off instantly kills them. Tanking Saurfang against the edge of the room makes this easier as whenever the Blood Beasts spawn they can be knocked off immediately.