I gathered up my strength and went back to the door. I didn't bother opening it or doing anything of the type with it this time; rather, I simply searched around it for clues as to where Jack was taken. And by some divine luck, I found something.
A photo of tall redwood trees lying not far from the door. The redwoods look to be the same type that you find in California.
The creature has taken Jack to California. I'm going after him.
Now I know you guys will say I'm walking into a trap. But I know this, and I want to walk right into it. This thing abducted me, abducted Jack twice. I'm going to find it. And I'm going to kill it.
I'm going to remain here for a few days and gather supplies, and hopefully a weapon. Then I'm going through the door. Let that creature find me - I'll kill it.