Using the twilight pet in pvp is no point, when fighting anyone average or better, they know its insanely weak and will fall over after 2 hits, specially in 1.6. So unless you wanna spend your few seconds before death resummoning it for 1.5 second (cast time) every 2 seconds, dont use it in pvp.
First off, let me say that I do not PVP, nor have I, or would I ever, bother with group trials.
~confused