Context: The film opens on October 30, 1988, nearly ten years after Michael Myers's last murderous rampage in Haddonfield, Illinois. An ambulance from Smith's Grove, IL makes its way along the road in a thunderstorm toward the Ridgemont Federal Sanitarium, where Michael, who has been in a coma since then, has been incarcerated. After the apprehensive transfer crew is seen off by medical chief of staff Dr. Hoffman, the ambulance makes its way up the driveway in the storm and back out onto the highway toward Smith's Grove. While in the ambulance, he hears that eight-year-old Jamie Lloyd, his niece and the daughter of Laurie Strode, his first target, is residing in Haddonfield. He immediately grabs and repeatedly bashes a hospital attendant's head against the wall of the ambulance and stabs his finger right into his skull. The other attendant, trapped by the ambulance's locked doors, can only watch helplessly. Soon after, the film introduces Jamie, who has been adopted by the Carruthers family and is still mourning the loss of her mother. Laurie supposedly died in a car accident eleven months earlier. Her older foster sister Rachel comes into her room and consoles her, telling her that she will love her just as much as her mother did. Rachel sends Jamie off to bed and exits the room. Jamie kneels down next to the bed and says her prayers when suddenly, lightning and thunder crash outside, startling her. The door creaks open and as Jamie gets up to close it, the reflection of Michael, donned in his classic white mask and black coveralls, appears in the mirror. Jamie returns to her bed and instantly, Michael's hand reaches out from under the bed and grabs her by the leg. Jamie struggles, gets loose, and runs to her closet. Opening the door, a second Michael appears in front of her, raising his knife. Jamie screams again, attracting the attention of her foster mother, Darlene, who rushes into the room. She finds Jamie, shaking on the floor of her closet, traumatized after what was only a horrific nightmare.Dr. Loomis angrily marches into Hoffman's office the next day, berating him about the transfer of Michael Myers. Hoffman explains that it was mandated by federal law; as he does, he is interrupted by a phone call informing him of an accident involving the ambulance that was carrying Michael Myers. Immediately Loomis smells trouble, and the two men drive to the site of the accident. The state police have secured the scene; the ambulance is upside-down in a river with blood on both the outside & interior. One trooper tells Hoffman it was likely an accident, but Loomis does not believe it. Despite Hoffman's admonishments, Loomis wades into the river & walks round to the ambulance's rear. Inside is a scene of horror; blood is sprayed all over the walls & floor of the ambulance. Immediately, Loomis heads toward Haddonfield, certain that Michael Myers is headed there. Meanwhile, at a gas station, a mechanic works beneath a car, calling for someone to hand him a wrench. When he hears no response, he slides out. There is Michael, raising a long, sharp pole in the air. He thrusts it down into the mechanic's stomach, killing him instantly. Loomis soon after arrives at the gas station and finds the mechanic's body, hanging by a chain from the roof. He also finds several other bodies and immediately sees Michael, standing against the back wall. Loomis shoots at him, but Michael disappears. Loomis scurries out to the exterior of the gas station, barely catching Michael driving away in a truck. Just after, the entire gas station explodes. Loomis survives after crouching behind a nearby barrel.Meanwhile, Jamie is coming home from school to see several kids coming upon her, taunting her that she has no mother. Jamie runs from the scene, crying. At home, Rachel plans to go out for Halloween with her boyfriend, Brady, but her parents refuse and force her to take Jamie trick-or-treating. Rachel protests and Jamie overhears, upset at the fact that Rachel 
 Question: Who learns of Michael's escape and goes after him?
Output: dr. sam loomis