This Phillies player totally forgot how the infield fly rule works

The Phillies aren't off to a good start this season. They're 0-4 in their first four games. Sure, it's early. 158 games to go! But it sure is frustrating to watch them make big mistakes on the easy stuff. All Cesar Hernandez had to do was stay on second base here since the infield fly rule was in effect but ... nope