You drew the 16. ellipse on the wall, which just made a little bit of it disappear. Looks like the wall is too thick, but you are finishing your ellipse on the door.
That did the trick. The wood fluxed away. This door was.
You squeeze through the hole and head for the next room.
A GOON stands a few feet in front of you. He does not look like someone who gave a cookie about you and your health or someone you could physically outmatch. He is also carrying a weapon. Best to avoid him first.
To the left of the door, you can see a scribble painted on the wall.
It is another ellipse, but this time, with a different ratio. Just like the other ellipses, it's glowing.
Right next to it, you see an arrow, pointing at the conic section, and the word "wipe".
You are surprised the goon didn't notice the graffiti, but that's probably because he looks way too minion to do something like that.