I was wondering why, despite its name, the Vortex Grenade has no actual Vortex - also confusing, considering that Void is "the absence of matter" and would suck stuff up anyway if physics has any kind of meaning here. As it stands, most enemies are not trapped by the grenade and simply walk around it... It works alright as a small area-denial tool, but only for a few seconds.
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I've now been noticing the exact same problem with my Sunsinger primary grenade. At least the secondary is more effective than the Voidwalker version...