You need to stand in the corner shown in the video all the way, aim a little to the left of the corner of the brick on the wall and take a couple of steps with a shift and throw a Molotov from a jump. In the case of 4:3, you can throw at the moment when the corner of the wall on the left side reaches the border of the screen.
使用场景
It burns the player on the stairs and under the stairs, but to always burn under the stairs you need to practice a lot of this hammer.