It's lag.
No matter how good/bad the connection is, there's a pre-destined lag. If you dual device you'll notice this.
e.g.
Walk using one device
On other device will have brief delay before that char moves
Hence when you use the skill when you seem to be in range, you are actually "out" of the effective range.
Try running in range of the dead player, stop or make sure you're in range for at least 1 second, and use rev.
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