The... noise? [Pausing to listen to it. It's obnoxious and ominous but... well, he's not sure he understands why it would freak the guy out so much.
One particularly loud boom and watching Aidan shudder kind of helps put two and two together though. The war. His camp had been bombed. So it was bringing up memories. But what could he do? He'd tried to hold him and Aidan pushed him away. He sat there, helplessly, unsure of what to do or say.]
Aidan. We're okay. I'm here and we're safe in the dome.