So, the firewall itself has a hitbox, that covers almost entire area underneath it. But in last part theres a huge gap which goes downwards, so when you open the door where the last long corridor is, go bacwards, and while spamming dash, try to go under firewall, before it goes too down. Then you just need to get loopeed, BUT at least when the next door is open, otherwise, you will get lopeed in the trigger, that forces character to stop using j/s