Ivern Blue and Red Buff Bug
Every time when you kill the red or blue buff. There are red or blue ball in the area.
It's very easy to reproduce. Since you can kill them and walk directly into the ball.
And it will have several different outcome.
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Crazy Running
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Slow motion
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Regular walking
Both of the outcome are continuously until the ball disappear.
Please refer to the videos
https://www.youtube.com/watch?v=x_bp5QI5rVw