Asuka swallows hard to try and get rid of the lump in her throat. She hates that she's not in control of her own emotions. She hates that just seeing something that reminds her of that day makes her want to curl into a ball and cry. She holds it all in check for a little while longer and takes a deep breath instead.

"...that's the kind of weapon the Mass Production series used."

She doesn't know how much Nagisa knows about her death. But he was supposedly dead at the time, so maybe he won't understand.