If you use the celestial nighthawk against a patrol target event you'll kill it instantly. It won't even register that you joined the event...it just ends. Make sure you take a few shots at it first.
I am really liking the super buff by the way, bungie.
Edit: does not work on event minotaurs. They survive with just enough health to be wiped out by a single pulse rifle burst.
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Sorry to inform you. But Bungie found golden gun to be effective and will revert it back by next patch.