"I also witnessed him hit a baseball over 400 feet," Sartor says ... "He was just messing around on the baseball field and he said, 'let me hit one.' And he hit the thing over the fence about 400 feet."
FYI -- a ball launched 400 feet would clear the fence in any Major League ballpark.
What makes it even more impressive?
Coach says this all happened after Zion completed his junior year of high school.