When Avengers: Infinity War is compared to something like the Harry Potter and the Deathly Hallows movies, which were broken into clear and distinct parts, it’s obvious what half a movie looks like.
However, in the case of Harry Potter, Voldemort doesn’t even obtain all the Deathly Hallows before the end of Part One.
The first part, not unlike Infinity War focuses on a villain trying to collect objects of power, and the heroes trying to stop him.
To be blunt, nobody is going to get any deader while the Avengers try to figure out what to do next.