The Captain

He really didn't mistake in recognising people. The woman's aura was colourless and private, but nothing insidious. She might not be naturally good at controlling her aura, but she did not give away much about herself through her aura.

Her aura was mostly retracted within her body as if she didn't want others to see her true self. That did not make her nefarious, only more self-conscious. After all, Warden himself had a similar practice of aura. 

"You," she opened her mouth again, "don't let me find you again... I might take you on that offer..."

Leaving those empty threats, she shot out of the water and flew away, the darkness covering her complete form. 

Warden watched her leave and couldn't help but mutter, "Why do I feel like I'll meet her again?"

Clicking his tongue, he sat down and went back to work again.