[The point is no one except Blue and known allies is ever trusted off the bat.

Custos takes a moment to consider what the "kiddo" you're referring to is - he's never heard the word before - but makes a beeline for Red upon hearing that he isn't doing well. This isn't because he figured out what kiddo means, but because he had to check to see if Red was the one not doing well.

Of course, it's easy to tell once he's close. Custos promptly starts nudging Red with his head, trying to get the trainer on his back so he can fly him home.]