Tryndamere Ult Bug

Sorry for my bad video making skills, I took a screen recording of a screen recording because I don't think I can trim the video using quicktime. Either bear stun has a strange interaction with my ult that lets minions ignore my ult, or those minions just ignored it on their own. The turret shot definitely didn't hit me when I died. Don't have anyone to help me reproduce :/

EDIT: Found 2 other recent videos of Tryndamere being killed through ult: https://www.youtube.com/watch?v=hKhiBp3IXzs https://www.youtube.com/watch?v=vs92OCM5OlE