I want to add Lohen being hypervigilent, knowing everyone's footsteps and habits can also be a symptom of PTSD
You can say this is just Lohen being observant, but the way I see it, paying attention to these details is what help him feel safe,
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I think Lohen has PTSD, especially when he mentioned having hard time adapting back in Mondstadt
PTSD, sometimes known as shell shock or combat stress, occurs after experience severe trauma or life threatening event.
The fight with Rerir didn't only trigger his past trauma,