Atem took off after Krystal and Seto.
By the time they located Serenity in the dungeon, the state they found her in, definitely would've qualified as one the blonde would not have wanted the senshi to see her in.
Serenity was hanging by chains made od dark crystal, a material she was weak against. Wrapped in the chains were electrified roses. Her back, torso, arms and legs were covered in bruises, only a few being obviously since being kidnapped, while the others were varying degrees of healing but had been something she had been hiding from view before. Her clothing was in tatters, amazing that anything was left to contain what little dignity she currently had.