Luna Lovegood
Luna isn't really all that freaked out. She's moving slowly and calmly like this is nothing new, but not slow enough to make her get trampled or drowned or anything. She grabbed a few things, namely her wand; a bag that she put snacks, clothes, and shoes in; her mice; and...that's about it.
She doesn't have anywhere to stay, but...she'll find someone, she's sure.