A little question about "spell lock"

[Marco08]

On youtube I see a lot of warlocks who are able to use spell lock after they sacrifice their pets with greimore of sacrifice, but it doesn't work on me, it's maybe bugged or something else?

[Kojak]

This is probably bugged, it is one of the "tricks" that you can do with GoSac for duels and arena mostly. Start with summoned demon, spell lock/disarm oponent on start and then sacrifice for DMG and second spell lock. In the middle of battle you can also use Flames of Xoroth and do the same ;)
Disarming a warrior just when he charges you is really helpful, but disarm from Void is not always working, don't know why.

[Tensami]

It works for me, so I'm slightly confused. What I often do even as afli, is start a duel with a felhunter, spell lock using command demon, sac, spelllock again using command demon and than quick summon a 3rd felhunter, however it will still have a cd on spell lock from the first use of it.