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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3 RepliesOr you can just do the time glitch and not have to worry about him climbing a wall or not. Got to the boss with 11 mins. and finished with 4 mins. remaining.