I've had this happen a couple of times, and it's really, really annoying:

I'm main-tanking in Trial Roulette or something, and the off-tank is a paladin. Usually, this means the paladin will be wearing significantly worse gear than I am, or I OT and DPS.

Nonetheless, during the fight, a little light tether to the PLD will appear, and I get an unremovable buff: "Covered".

This is, as a dark knight, extremely annoying. Not just because it's over-working the healers if the paladin's gear isn't that great, but also because at various points getting hit is where I get my MP from.

Can you all just... not? Unless there's an actual, genuine reason to, which, in Trial Roulette, there absolutely definitely isn't.