Jon and Beth are laying on the blanket looking up at the beautiful blue sky when they hear, "Daddy, come swimming with me." Romeo is standing over them, dripping water on them.
For Beth to hear those two words in the same sentence makes her weak at the knees. Her natural response is to look at Jon, for an answer, a clue - for anything.
Beth and the kids were all finally asleep, after a long day of walking the streets of Milan, everyone was exhausted. Beth dozed off with the twins as she laid with them, getting them to wind down.
The feeling of your gut and your heart racing to hit the floor is a feeling that cannot be described. When Beth hears what Romeo says about Brian, she's certain that her stomach and heart ran out of her body, leaving her to deal with the bomb, strictly with her mind.