Knight Crabs are able to be held for an indefinite period of time.

They have a 5 minute rage timer but their "rage" only effects their attack damage, their defence and resistances stay the same. This makes it so people can grief hold the crabs for hours if they like. We had a RDM hold one for 10+ minutes with grav/sleep/bind (never got resisted) and then they killed it by hitting it for normal damage with a THF. They should not have been able to do any damage to the crab it should have taken 0 damage and killed them both, I just want to reiterate they did take increased damage of about 200-300 damage when hit.

tldr raged crabs damage is fine but defence and resistances need a massive buff to stop griefing, they should be pretty much invincible when raged.