Side Quest : SS end of path 3 - Instakill

So Steve rank 4 with 3/3 fortitude purify prefight go into the 3rd path SS fight with full health and gets instagibbed. 100% to 0%. Is this suppose to happen?
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If you have actual buffs on you at the start of the fight, Symbiote Supreme will instantly nullify them, causing high damage.
I don't quite remember how the symbioid prefights work, though