They might be shocked. Some Avengers could be amused to see different takes on their Infinity War experiences. For example, Thor might be surprised to see how fanfiction writers portray his journey to get Stormbreaker. Others like Iron Man could be either irritated or impressed by the creativity in how his character is used in these fictional stories.
The characters might also get confused. Fanfictions often have their own unique plotlines that can be quite different from the official story. So when they see these strange twists and turns, like Thanos suddenly becoming good in the fanfiction, they'd be scratching their heads and trying to figure out what's going on.
Some of them could be in denial at first. They might think it was some sort of trick or false vision. But as they watched more and more of Infinity War, they'd have to accept the reality. Then, they'd start to think about how to use this knowledge. Maybe they'd try to find a way to go back in time like Dr. Strange did in the real movie, or find a weakness in Thanos that they didn't notice before.
The Avengers would likely have mixed reactions. Captain America might be very protective, seeing it as his duty to safeguard Black Widow and her unborn child. Tony Stark, on the other hand, might initially be more concerned about how this would affect their battle strategies.
They would be shocked. The trailer might show new and powerful enemies that they haven't faced before. For example, Thanos looks really menacing. Some of them would be excited to see their new powers or weapons on display. Captain America might be thinking about how to lead the team better against these threats. And Black Widow would be sizing up the potential new allies or enemies in the trailer.
Avengers Infinity War is largely based on the Infinity Gauntlet comic. Many key elements and plot points are drawn from it, but there are also some creative adaptations and additions to make it work for the cinematic universe.
It's a complex and epic tale. Thanos is on a mission to collect all the Infinity Stones to wipe out half of all life in the universe. The Avengers and other heroes unite to try and stop him.
The plot of Avengers: Infinity War involved a massive battle between Thanos and the Avengers. Thanos wanted the stones for universal balance in his twisted way, and the Avengers had to prevent his plan. There were many epic battles and emotional moments throughout the movie.