Spoilers plz ?.. why he panicked and why his eyes colour changed?

Tacking myself on here because i would also greatly appreciate spoilers and answers to these questions!

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he's a ghost alpha (a special type of alphas) he can transform betas into omegas through the knotting and after the knotting his eye color changes, that's why he wore sunglasses in the car !!

Omg! Thank u i love u