Sam is alerted to Gadreel's possession of him by Crowley in the later episode "Road Trip", at which point he revokes his permission and forcibly expels Gadreel from his body by ordering the angel out. To his horror, he also finds out that Gadreel has killed Kevin using his body to prove his loyalty to Metatron. Sam is appalled and angry at how far Dean will go to keep him alive, feeling betrayed that Dean not only helped Gadreel possess him and hid the truth from him but also for persuaded him not to finish the trials and thus kept the gates of Hell open and allowed demons to continue wreaking havoc, all to keep Sam alive. Sam lets a guilt-ridden Dean leave at the end of the episode. In the following episode "First Born", Sam works with Castiel to extract a lingering piece of Gadreel's grace (angelic energy) so that they can track him. Feeling guilty over the deaths he could have stopped, especially Kevin's, Sam urges Castiel to extract all of the grace still inside him, even though it may kill Sam because the grace is keeping him from reverting to his deathly state prior his possession. However, Castiel refuses to risk Sam's life. As a result, the amount of grace they gather is insufficient to track Gadreel.