Board Thread:Speculation House/@comment-14138255-20160807005311/@comment-10390252-20161004125624

Actually, it would be a problem for the reason explained in that scene: Binding two people's aura's together is a can of worms and may permanently alter the transplatee's personality if the two Auras are sharing the same meatspace.

That's not a problem when the person whose aura unlocked is normal. Jaune Arc has a lot of Aura and an undefined Semblance. Pyrrha's death was also abnormal (I'm pretty sure the number of people vaporised by a Maiden's power is in single figures). All in all, there are a lot of hints that something could go weird (not 'wrong', just 'weird').