User blog comment:QueenArasene/The Aura bore Alice/@comment-4536066-20130221032556/@comment-5049048-20130221094204

However, Azzanadra states that he "Cannot feel the trace of his death", which hints at the fact that mahjarrat do know whether one of them is simply away or dead.
 * Feel if another mahjarrat is dead or alive
 * Have a certain understanding of how powerful another mahjarrat is

On your example, I would say it is more likely that one would have to use their aura senses more actively to detect power levels - you may remember Zemouregal commenting on Lucien becoming more powerful. If we have established the fact that you can tell a mahjarrat by being in obvious proximity, how does this work with shape-shifted mahjarrat in a group of other humanoids? If that works, why did the Zamorakian mahjarrat not do it ages ago, when Zarosianism was wiped from the world? That last point is depressingly true.
 * Should mahjarrat be able to trace each other via their auras?
 * Should it be allowed to hide your aura?
 * Should we settle down on the aura business and return to more lore-abiding realism? Do we want to?