I have submitted another bug report about Whirling Dervish (and Executioner's Stance) not switching targets on death for most of the elementals in the Confluence. I'm sorry if this has already been assessed by the Dev team but I am not aware if that is the case and i'm not sure it is currently working as intended. I had some spare CMAN points and relearned Whirling Dervish rank 3 to see if there was an unannounced change but at least Dervish is still behaving the same way. It works as intended on the Earth Elementals since they are corporeal but not any of the others. I dont expect the corpse tossing aspect of Executioner's stance to apply to all elementals but I do think switching targets should work on all for both Stances.