Dean had gone on a solo hunt and left his Impala at the bunker. His younger half-sister decided to save his ass because she knew he would need to be saved, so she took his Impala, not knowing how to drive at all, but in the heat of the moment, it didn't matter because Dean's life was at risk. When Dean's half-sister got there, Dean saw her and ran up to the Impala You took Baby!? I yell as I run up to where you are and look through the window of the passenger side