When I first tried to understand Bridge pattern, I got it confused with Adapter pattern and then Abstract Factory pattern. In my defense, these patterns do have features overlapping. But when I got into depth of bridge pattern, the advantages got clear i.e. decouple an abstraction from its implementation so that the two can vary independently.
Yes that is very confusing line. A good read to demystify the concept- http://softwarejedi.wordpress.com/2013/04/16/design-patterns-and-scala-the-bridge-pattern/