After Thaviks disappear and goes invisible after taking damage, it is possible to see him climbing the walls on the arena. If you shoot him, he will fall off and instantly die, ending the strike
Video proof: https://youtu.be/eCRjzlDBuCY
I assume this is a cheese.
[spoiler]Video not mine[/spoiler]
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This nightfall is bullshit if you're gonna let people that did it early have a burn you should let everybody have a burn what were you thinking bungie done 1000 nightfalls and never had a problem like this wasted 2 hours on this thanks for tucking g up the nightfalls