Castet holyword on another player and then tried to debuff him with these skills, that reduce defense and he resisted all of them both skills were up to our mastery level (Silkroad gold). So we think holyword makes the whole 3rd skill line useless. We also tried sleep and it broke after casting dots and even after casting a debuff that does not do any dmg.
Well we guess you are asking that other guy in the other SRO warlock guide said because of the things. We are not sure if we are right because we do not have this skill yet but we think he ment that bloody trap causes a bug or something like that, which will prevent sleep to break until bloody trap explodes or the 20 seconds of sleep are over.
Sleep is ment to break after the next hit on its target but maybe if you cast bloody trap before sleeping, the game (Silkroad online gold) takes bloody trap for the next skill on this target, ignores all other spells that you will cast during that time but that is just our thought someone who got this skill should try it.