Video Firing a 50 Ft. Flamethrower in Super Slow Motion 4K (Video) By Greg Baugher Posted on February 9, 2018 1 min read 0 0 316 is one of our favorite YouTube channels. There’s just something awesome watching things in slow motion. In their latest episode, they light off a 50 ft. flamethrower and catch all the action on their 4K high-speed cameras.