To be fair take my advice with a grain of salt. Play how you feel! If you are not going to go around inspecting the aggro mobs around a camp poking your head around corners and shit pulling for a group that your not in & has a puller and you're a caster, then yea prob listen to Daywolf. But wouldn't worry the group would ask you stop doing what your're doing if you're doing something wrong.
But sitting next to a CE group tossing haste or something to a hasteless group is generally welcome
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hell, 100% of the Crypt groups that I have been in have had a perpetual stream of rogues following us backstabbing until a spot opens, never been a problem, always welcome.