Your aim and tracking is punishing and almost bot like. Especially at 16:18 on Haze. Phenomenal. I like this build and am going to try it. I like the idea of getting the burn applied much faster and letting them cook. It takes them out of the fight quick.
Could you talk a bit about your approach to different scenarios? The item build is helpful, but positioning, when to use abilities and when to farm/fight would also be great.
quicksliver reload is kind of a waste on infernus imo. only thing you can put it on is 1 but your 1's range is pretty low (20m) and the CD is pretty long even if you have both charges. I take active reload and I think it works much better since you get a good chunk of lifesteal and fire rate when used. super helpful to proc your burn.