You shot your first shot too early. The warlock has a brief period while during the animation of self resurrect where he cannot move or take any damage.
If you had waited half a second longer you would have been fine
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But the second shot could kill him, no ?
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No when a warlock is radiance it takes two golden gun shots (or multiple shotguns). Your second shot hit and registered but wasn't quite enough.
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He said self rez not radiance
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The skill itself is called Radiance. The self res skill is called fire born