Tibbers won't go on a rampage! (Gameplay)

When playing in the Howling Abyss inside of a 2v2 custom match with my friends. I was put as Annie, since Tibbers had his update I thought I would use him to attack them, and if I died he would go on a rampage and continue attacking them. Instead, Tibbers, just kinda... stood there. He would stand in his idle animation until something would hit him, and most of the time, even that wouldn't work. He would also be impossible to control during the rampage part of him spawning, this also made him just stand there calmly. This is a serious bug that I decided to report and I don't know whether or not it would do that in a public ARAM match since it would take a long time to reproduce the effects.

The teams were as follows:

Bottom Team Morgana Leona

Top Team Annie Urgot (Who went afk)

I do not know if this particular grouping of champions means anything, but I thought I would put it in anyways.