It's happened about 4 times now since the start of the season. I'll cast my super and will not be able to do anything except the Shockwave part of the super, which makes the super unbelievably useless, not to mention looking stupid to your teammates.
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Doesn't matter. It's a warlock bug. It'll be a lower than a low priority fix. There's like 10% warlock playerbase. Fixing a shader for hunters has higher priority.