Those shocking 'Yellowjackets' season 3 finale reveals, explained by Sophie Nélisse

Sophie Nélisse as Teen Shauna and Jenna Burgess as Teen Melissa in "Yellowjackets."

Kailey Schwerman/Paramount+ with SHOWTIME

• "Yellowjackets" season three ended with a few big reveals.
• Sophie Nélisse, who plays young Shauna, has a pivotal role in the finale ending.
• Nélisse said she's enjoyed playing young Shauna as a villain, but still has empathy for her.

Warning: Major spoilers ahead for the "Yellowjackets" season three finale.

Shauna went off the...