Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

In Stranger Things 2, they say the portal takes a lot of energy to close, and that only El has the power to close it. But in the first season, portals to the Upside-Down crop up all over the place- in the Byers' home, in the tree in the woods, and by the swimming pool. What's the difference between the Hawkins' lab portal and the other ones?
Why is the portal so hard to close in Stranger Things 2, when the monster opened many in the first season?

I just saw The Adventures of Tintin and I could see that Captain Haddock's character has a very thick Scottish accent. I don't recollect any reference made in the original series by Hergé about Captain Haddock's Scottish heritage. Is there a particular reason for this?  PS: I had to tag this question as something, since accents/tintin weren't in the existing tag list
Is Captain Haddock Scottish?

In the movie Predator  (1987), near the climax, when the Predator finds Arnold, it did not try to kill him immediately. Instead, it goes near him and checks his head and removes its helmet (I am assuming that it would be its helmet).   Why did it not kill Arnold immediately as it killed everybody else? Did checking Arnold's head mean something?

Why did the Predator not kill Arnold immediately as it killed everybody else?

