One of the balls is moving extremely slowly. Is that normal?
When balls bump into each other, it is possible for one ball to become almost motionless. This could happen, for example, if it hits another ball exactly on its side. Or if a large ball hits a smaller one head on. If you still have other balls, just keep playing and try to keep this slow ball as an extra “insurance”. If it’s the last ball in play, you can use the space bar to give it a nudge.
