I've faced off against Deathbringer Saurfang in both 10-man and 25-man, but only downed him 3 times on 10-man so far. On 25-man, the raid keeps wiping (on two different raid attempts). This is of course because Saurfang casts 3 Blood Boils in 25-man (which each last 24 sec, instead of the single Blood Boil in 10-man, which lasts 15 seconds) and he summons more Blood Beasts (5 vs. 2), causing him to gain Blood Power more rapidly than in 10-man. Key to the fight is trying to minimize his gain in Blood Power, I know that.
But there are two things I don't know yet, with regards to the Blood Beasts. As a healer, I don't really focus on the Blood Beasts to really analyse those two things during a battle, so I hope someone else knows.
1) How many Blood Power charges does Saurfang gain when a Blood Beast hits a player? I've only found one post on WoWhead claiming it's 3 charges per hit, but no other source that confirms this. Is this true (for 10 and 25 man versions)?
2) WoWhead also lists a spell "Scent of Blood". Its effect says that the Blood Beast picks up the scent of blood, reducing enemy movement by 80%, but increasing their DPS by 300% at the same time. Is this effect actually happening, and if so, who gains the movement penalty, who gains the DPS boost? The tooltip info is not clear on that - the wording "enemy" is ambiguous; it could easily be read from the point of view of the player, as well as from the Blood Beast.