[ It sure looks like he's not noticing a thing. The good thing about PTSD though is that you're in a constant state of high alert and although Aidan has so far done a good enough job hiding just how frazzled he is, it's difficult to do so when you don't know that you're not alone.
When he does notice someone creeping up on him, the reaction is instant. He damn near jumps out of his skin, turning around with the plastic gun aimed at the sneaky intruder. ]