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

In the middle of The Avengers, the team is split up after coming together on the S.H.I.E.L.D. Helicarrier. Bruce Banner/Hulk end up in an abandoned warehouse. Thor ends up in a field. Shortly afterwards, Tony Stark determines Loki's next destination, Stark Tower. This information is never transmitted to Banner or Thor. However, both of them show up in New York City and join in the climactic battle. How did they know where to go?
How did Thor and Banner know where to go?

In Supernatural S08E12 AKA As Time Goes By it was mentioned that Abaddon was a hired gun in the series, was it ever revealed who hired Abaddon?  Larry Ganem described Abaddon as a "hired gun" in "As Time Goes By".
Who hired Abaddon?

I've never understood how Kirk, Spock, and Bones got back to the present at the end of “City on the Edge of Forever”. Going back to 1930 is simple enough, they stepped through the portal at the right moment, but there was no portal on their end! How did they get back?  Finding an answer is proving to be difficult because even after trying numerous search-term permutations, I only managed to find a single mention of the discrepancy.  I can understand if maybe they wanted to focus on the emotion and stuff of the episode, but it's a science-fiction show, and this was one of the first incidents of time-travel in the whole franchise, so getting back is a fairly big issue that can't just be glossed over.

How did they get back in “City on the Edge of Forever”?