Neville gave Megan the time she needed to calm a bit. She was fully entitled to be upset. When she said she'd wash the handkerchief, Neville shook his head and smiled back at her. "It's alright, I have loads. You can keep it." He was probably the only one on the planet under the age of 80 that still used handkerchiefs.
Nodding along and knowing exactly how Megan felt, Neville offered some peace of mind. "You don't have to tell me anything. If Hannah wants to let me know what happened, she will." Neville didn't want Megan thinking she had to betray any kind of confidence she had with Hannah. He himself was very close with the woman in question so if she wanted to tell him, she would. "I do know, yes. I have a feeling though that you just supporting her and being there for her would be a great help."
He hoped it didn't sound too corny or common to say such things, but a lot of times it was often the best way to help, to just listen and care. Neville was still holding Megan's hand with his trying to reassure her. "I'm betting she went somewhere to cool off and when she does, she'll need you." Smiling kindly, he squeezed her hand lightly. "She'll be alright. I'm sure of it, especially if she has you and her other friends to support her."