Vanndar Stormpike - Evade Bug

Hello everyone, first post here so be gentle with me.

I just played a game of Alterac Valley a short while ago and when we got to killing Vanndar, we had him down to 1 HP at which point he just started evading. We were unable to reset him and thus Alliance won. Has anyone else experienced this issue?

Bugtracker report: https://www.warmane.com/bugtracker/report/17814

Spoiler: Show

http://i.imgur.com/NfobEb9.jpg

Thank you for reporting it on the bugtracker, our QA team will make sure to check if it occurs again or if it was just a one time glitch. However, posting it on the forums won't speed up the process, keep that in mind next time.