Demon Slayers can freeze bosses.

Yes, this skill has potential to be abused. No, I don't think it will. Keeping in mind that bossing for money is only done at the very high level, and getting a bandwagon of Demon Slayers up to that point, ALSO with adequate gear, AND with contacts, and I don't see Demon Slayers having any more potential for getting on tip top boss runs than any other new class.

Also, that drain buff looks far more appealing than their little grab thing displayed, for bossing.

You don't even need funded Demon Slayers, just get them to high enough level and perma lock the bosses while you let everyone else do the DPS. Or in other words, make DS a SUPPORT job instead of a damage dealing job solely for high level bosses. That's like saying you need funded Bishops for their damage at bosses.

On a different note, is the "Grab" a single target or multi-target?
Also if it supposedly doesn't work on Zak, then I'll be the one to assume it doesn't work on "Major Bosses", such as Zak, HT, PB, and Empress.