How do you get the trooper door to stay open at the start of 4-3

its just a visual glitch...even if it's(eems) open, it will recreate itself by opening with trooper.

additionally you cant go through without opening it...the only method i'd see was, if you double jump ground pound with grievous and switch to droideka while doing that, so you get that famous extra boost to clip over the wall's hitbox! :)