Football play

Question
What is a bubble screen and how does it differ from a screen?

Answer
Dear Ronald,
A screen is a screen. The only time I have heard a screen called a bubble screen is when I was coaching flag football. A bubble screen is when a group of football players surround the ball carrier (front and back like a bubble) while he runs for a touch down. Most screens plays have blockers in-front of the ball only.

I hope I was of help.
Your friend, Coach Louis.