A runner can not be called out for running out of the baseline to avoid collision. 7 innings long The batting team generally provides 1st, 3rd and home plate umpires. Making a quick and decisive call will avoid annoying arguments and do-overs. No taking leads, no stealing bases. Strike zone is approximately knees to armpits high, across the width of the plate.
Any pitch landing on home plate is a ball, no matter how high the arc.
This avoids purposeful dropping of the ball by the infielders in order to turn double plays.