Board Thread:Theories and Speculation/@comment-4008620-20190418195146/@comment-32685487-20190504033014

I think its more logical to say she only needs to think the person has died to awaken her MS. It's the trauma that does it. For example although it is anime only, Sasuke awakened his Mangekyo Sharingan thanks to Itachi "dying" by taking both the Naruto and Sasuke's attacks to stop their fight. We later find out he didn't die of course and has his own MS and Susanoo yet Shisui is still alive their too.