[RMMV] PROBLEM WITH 3-RAILS CHASE SECTION

Hey people, i'm in a pinch here.
I'm trying to make a section where the player has 3 different roads where he can alternate with, similar to some section in 3d Sonic games where you can alternate between 3 different rails.
Now that portion is pretty much done but there's another problem, I want to make a wall of fire chase the player, that if it touches the player, the section resets and the player needs to try again.
The problem is, that it isn't a wall of fire, because of the nature of the section, the wall of fire needs to alternate between THROUGH ON/OFF but if I carefully set the route in CUSTOM ROUTE, it ends up being all scattered, and it sometimes even goes through the player, making the player end up behind the firewall.
It's kind of hard to explain, but maybe someone here has any ideas or tips on how to create it properly.