On the ground a boy in a red sweatshirt is leaning over holding a football and two other kids.
Timmy hikes the ball as Joe calls the plays
Lots of boys play football. There is no way of knowing if the boy's names are Timmy and Joe.
The boys might not be named Timmy and Joe.  The boys may not be practicing a snap.  Timmy might be calling the plays.
The boys may not be named Timmy or Joe and the latter may not be calling the plays.