LitCharts assigns a color and icon to each theme in Harry Potter and the Cursed Child, which you can use to track the themes throughout the work.
Parenthood
Time, Mistakes, and the Past
Friendship, Family, Love, and Bravery
Reputation and Expectation
Death and Sacrifice
Summary
Analysis
On the moving staircases, Albus and Scorpius both seem abjectly lonely. Then, their staircases meet and they look at each other—“lost and hopeful.” But Albus looks away, and their friendship seems totally broken. Albus is guilty, and Scorpius is in pain.
This silent scene indicates just how “lost” Albus and Scorpius are without their friendship. Even knowing the havoc that they have wrought on the timeline, the break in their friendship prevents them from doing anything about it because without each other’s friendship, they don’t feel that they can fix what they’ve done alone.