User blog comment:Morning Star TM/RWBY - Weiss freezes a Death Stalker/@comment-26198742-20200208212922/@comment-44501217-20200209082310

Also, i found the link where Kerry Shawcross stated that these stuff were cannon to the show:

https://www.youtube.com/watch?v=vJ6vKatAUbs&feature=youtu.be