[Marco's eyes do widen a bit warily. Not because the speeds or mid-air worries him, it's just staying on Roxas' shoulder without clawing him accidentally that concerns him. If he claws up Ace, it's not a big deal. If he claws up Namur -- well no, that's pretty bad since the sharkman goes nuts, but still, Marco doesn't claw Namur because he sits on him differently. And Jozu is made of diamond so he never had to worry about clawing him. That and Jozu's twenty feet tall, but the point is, Roxas is a kid and Marco's talons can take huge chunks out of people so...]
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[He'll just have to be VERY careful.]
[And let go to fly if he gets too worried.]