THIS IS THE ALT ACCOUNT OF SCHWANE- Please do not send me messages for topics i have started on my other account, thanks!
My top theory:
I think that Glimmer is Cyrah Endal. They are both Flashers, and Cyrah could have manipulated light to look like she was fading away. Also, she could have come to the senses to let Tam go because he was going to help his friends (in this case, Wylie)