Upon review of the footage he had a pretty sizeable amount of health left (At least 100K) when you all died alongside from what I know that his chest closes pretty soon after he does the wipe mechanic I'm going to go ahead and say you failed to kill him.
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review again and you will see his health was gone before he is starting the wipe mechanic.I'm going to go ahead and say he killed Oryx.
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There was health left.
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look at the final frame before he killed us, there was nothing left plus there was a sunspot on his chest.
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Did some more searching I was in fact correct. When you wipe the health bar disappears exactly like his did I'm not entirely sure how to send a screenshot but he did in fact have yellow on his healthbar when you wiped also more info I gathered his chest closes when he in fact wipes a team plus sunspots don't deal a lot of damage in fact they can struggle with red bars.