Marlene/?
Marlene had seen battles and she'd seen the aftermath of them, but when she arrived at King's Cross, she saw Gellert take away Dumbledore's body and that wasn't something she ever expected to see. Even knowing that he was dying hadn't prepared her for that.
She literally froze for a few minutes before remembering that she was here to do a job. She went where the body had been, searching for the last piece of the puzzle. She could feel the magic coming from it and knew that this had killed Dumbledore. They couldn't leave it there; they'd have to find out why this was so important.
She cast a spell around it, making sure to contain the magic and then cut a piece of her robe and threw it over the trophy, so that there was no direct contact.
She continued with her investigation, but all too soon, she got the message from James, and she wasted no time. Even with all her friends here, she knew that they had no time to waste. She went home and got everything she needed, and then went to the farmhouse, but found that most of Dumbledore's things were gone, which meant that they were already at Hogwarts. With that, she Apparated to the school, and made her way to the castle.