Burning monolith impossible to see safe line that one shots

I don't know what to do or what settings to change I died 12 times and every single death was when he goes under and their is a safe line across the screen that you have to go in 7 ish times and It is so hard to see where it is. I do not know what to change but i'm just guessing. Not referring to the jumping around he does with the circles you have to run into those are easy.