What are the consequences for a bus driver who swerved to avoid colliding with another car, causing the bus to go off-road and result in the death of a person who was standing outside, knowing that the other car was the cause of the accident?

The questioner is the one who directly committed the accidental killing. When a direct perpetrator and an indirect cause combine, the direct perpetrator is given precedence and is responsible for the compensation, because direct transgression is among the strongest causes for liability, and "the direct perpetrator is liable even if he did not intend it."