I only got my legs and head soaked, my torso was somehow mostly dry xD Still, it was cold. And my dad LOVED seeing me freak out to it. He loves pranks like that.
Well your Charries could fit into the roleplay by...
Being in the scene between Argo and Calia, and hearing the noises too,
Being at the feast held at the camp, or being near Sulvias cave?
( But I doubt they can get that close to Sylvia's cave, )