This mission was a little frustrating for me at first.
Far too often I found that a group member would not click on the crystal and then when I switched back to chase mode it would run back and get lots of agro on route to the rest of the team.
I tried just using my SK + Shaman in the North, East, West and South rooms but would have issue with agro from random mobs (or the charm) just as the echo went live which really messed up things.
To get round this I set up 1 button for setting mode to Normal
And created buttons to set mode to chase + navigation buttons to each location. I prefixed the various commands with :-
/noparse /dgge /if (${Spawn[${Group.Member[TankName]}].Distance} < 150) /...rest of command (i.e. /boxr chase)
This way when I needed to move North, East, South, West or back to main room I would click button to set Mode to Manual and then I would click button to move to new location. Group membrs would only follow the commands if in range of tank.
This way if any of my team failed to follow the rest of the team then it would stay in place and not chase group when I went to Chase mode or moved about.