Originally Posted by jefrs
And the purpose of that is to play two or more melody lines at once ...
Don't believe everything you read in the Wiki. It is more than a little short on musical theory. It says it is used for technical death metal (is that not an oxymoron) and the fingers are parallel to the strings. Now I've watched Albert Lee do this, and his fingers are perpendicular to the strings, indeed his pinky is also in use but hidden under his hand.
Hybrid picking simply describes playing with a flat pick and fingers. Playing single lines doesn't stop it from being hybrid picking and to assign a single purpose to it is ludicrous.