What helped the Chargers defeat the Raiders?
Rule 3, Section 21, Article 2
“It is a Forward Pass if: (a) the ball initially moves forward (to a point nearer the opponent's goal line) after leaving the passer's hands; or
(b) the ball first strikes the ground, a player, an official, or anything else at a point that is nearer the opponent's goal line than the point at which the ball leaves the passer's hand ...
Note 4: A fumble or muff going forward is disregarded as to its direction, unless the act is ruled intentional. In such cases, the fumble is a forward pass.
Rule 8, Section 1, Article 1, Supplemental Note 5
“An intentional fumble is a forward pass.”
From 2006 Official Playing Rules of the NFL
Here's an article straight from a San Diego newspaper (Union Tribune)that pretty much flaunts the fact that the Chargers got away with one. "Jackson's Action Ends In Satisfaction."