How did Alby sacrifice himself in the maze runner?

In "The Maze Runner," Alby sacrifices himself to save his friends when he is stung by a Griever and becomes infected. Realizing that he cannot return to the Glade, he leads the Griever away from Thomas and Minho, allowing them to escape and find a way back. His selfless act demonstrates his bravery and commitment to the group, ultimately enabling Thomas and Minho to survive and continue their fight against the dangers of the Maze.