You want a roaring flames increase from 15 to 20 seconds?
You do realise that lethal current on arcstrider was nerfed from 10 to 5 seconds with forsaken right?
You have 3x the amount of time hunters have...
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Lethal Current's always been 5 seconds for the entirety of this game's lifespan. Here's footage from both the beta and the full release(pre-Forsaken) that prove otherwise. Beta: https://youtu.be/l2Kf53bggTw (skip to 4:08) Pre-Forsaken: https://youtu.be/6bhF21-LBqw (skip to 4:23) Moving past that, it's not really sensical to compare the two. One works for the entire subclass(though doesn't buff it by much) while the other only works in Super, and guarantees you killing an enemy Super. The latter being Lethal Current, provided you're within range and the hit(s) register in time. To me, it'd make more sense to compare Roaring Flames and Combination Blow. They both provide flat bonuses to your ability damage, and can be chained/reprocced constantly via charged melees. As well as being active far more often in your overall gameplay.
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Unless you have footage, or are unaware of some glitch/button combo you're causing, that's impossible. Here's footage of someone else using Arcstrider with Way of the Warrior on Val Ca'our. Skip to 0:18. They activate their Super, dodge before starting DPS, and Lethal Current is active in the middle of the buffs for 5 seconds. https://youtu.be/T43_cN1gycY Maybe you just have a different copy of the game or something, because this is how it's always worked for everyone else.