Lacrosse Drill Demonstration
When the ball is rolling towards you, you need to make sure that you put the same foot forward as the hand you've got at the top of the stick.
Make sure the hand at the bottom of the stick is lifted higher than the one at the top of the stick, to form a barrier.
If the ball is rolling towards you, get down into that barrier position, and bring the ball up into a cradle.
If your bottom hand is too low, then the ball will bounce over your stick.