I would like to make a post about my and my groups initial thoughts around the new affix back bug. So over all I like it very much but there are a few things that I think would be good to mention when it comes to the mechanics.
First off the biggest issue would be that the person who has aggro can still get the bug on them. For the most part it is not a very big deal until it comes to very heavy ranged enemies and bosses with aoe attacks that can 1 shot anything but tanks (ex. Mist Keeper with ranger dps).
Second thing that we noticed was that the orbs were spawning even out of combat on players as well as persisting through death. This could put people in a bad situation where if the player was dead for an extended period of time they could get more stacks of back bug and if they are not removed before that player respawns then it could lead to a lot of frustration getting back to the group.
Last thing we thought of was that the orb sound effect was the same or very similar to the shaman stun totem. This caused a few questions between our 2 shamans wondering who it was on or if it was on anyone. The only thing we could personally think of to help alleviate this would be a different sound/tone of the orb or something visual to the person that has it on them.
Other than that we think that it is an interesting affix that may need some tweaking when it comes to being less brutal to ranger in particular.
~My thanks, Tallia