Depending on the effect you're trying to create, you can either put each separate action in its own paragraph or lump a bunch of action into one. Commander Walker, checks his scanner for life signs. Notice how that builds the tension and keeps the images separate in your mind. Miller chases it, sliding on the wet grass. Halloway runs from left toward the ball, too.
Fans reach over the center field wall, fighting for position to catch the dropping ball.
You'll have to see the movie to find out what happens next. So, use Action to create the effects you want to create in the mind of the reader. One other thing. Also, avoid prepositional phrases when a good adjective or adverb will do. These two things bore the reader and usually take up more room than their more interesting, active replacements.