Bootshine -> Twin Snakes -> Demolish -> Fracture -> ToD -> Combo again. You have a ton of time to slot them both in in GL3. I'll generally pop B4B just before the Demolish if available so you have all 3 of them ticking at 56% damage+. Fracture has the same duration as Demolish so you can always just throw both out in succession to easily upkeep without any thought.
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