More specifically, the fact that it has a vertical blast radius equivalent to an atomic bomb's mushroom cloud is what makes it OP. There's no reason why it should kill me when I'm 30 feet in the air, Bungie. That's just overkill.
Edit: Let me make it clear for all of you. Fist of Panic is a ground pound. The important word there is "ground". Fist of Panic, a "ground" pound, can take out people 30 feet in the air. That's my problem with it.
Now watch as the people who abuse it come to defend it.
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The way I think of it: If there is an earthquake and you are on a plane in the sky, you and the plane will not just crash out of the sky for no reason.