im bad at explaining it but basically, when you enter that first hallway, make sure you are sliding and have a fully charged core eject and just before the door, look down about 45 degrees and shoot it, you should land on the door frame of the door behind you and you uncrouch. look for tutorials on youtube for a practical demonstration idk
when you enter the first hallway open the door at the end of it because that unloads the room behind you allowing for the clip, then you just need to dive at the door frame in any way(core eject,just a regular dive etc) and make sure not the open the door because that will load the previous room back in
Edit: using the core eject is the most constistent for me
Come one, come all, the day of reckoning is here! The ULTRAKILL speedrunning scene has grown from its humble singular channel and is ready to spread its wings in a server of it's own! Attached is the link to the server, and a link will be on the speedrun.com page for anyone you may know that wants t