Just found that if you cast Call of Warband...while it is halfway finished casting repop your instance...you will go back to zi (per the repop) and then pop right back at your original location you started casting Call of the Warband...am sure this is a bug that is not intended...or is it ok to use this unintended feature?
May just be a 1/100 lucky chance on the timing. Please let us know if it can be reproduced casually.
