That is actually pretty bad, and in this case, I would definitely agree to see a kick option even though I can't help but feel it will likely be abused. Even so, leechers are bad in any MMO and ruin the experience for everyone else playing.

Maybe they can implement it in a way that if you are locked out of the boss battle, you don't receive any tomes at all or a chance to loot? I wouldn't want to see people get kicked for the slightest mistake.