Maybe just stupid and intended, but I remember that we couldn't always Enslave Elite Demons. Today at Throne of Kil'Jaden, I enslaved one of the big ass demons, while maintaining the Grimoire of SDacrifice buff. So it's sacrificing your pet to increase damage, and get passive health regen + enslaving a badass elite demon, stack that with 9 stacks of fel blood and you can solo entire elite packs.
Maybe this was all intended, but I thought enslaving would remove Sacrifice, and it surprised me millions opf HP mobs are actually enslaveavle.
Call it stupid, let it be useful to those who didn't know, whether intended or not!
Edit: Enslave stays for 5 minutes, but can be recast whenever. So go grab your super elite demon at throne of kil'jaeden. ^^