I'm planning to tackle Atem later but DUH. Sunny is convinced he HAS to make light to help Seto and Chuuta, so of couse he'll throw himself on the line.
Atem may TRy to be careful but he's new to all that stuff and may get reckless if someone else is in pain/danger and OH BOI HE IS GLAD THE NILE HAS NEVER BEEN POISONED BY WHAT FEELS ANT VENOM ON SUPER POWERS