The Knight is placidly lying half-on, half-off a particularly amenable turtle, taking advantage of their light weight and unthreatening presence to be taken for a lazy ride when Chip comes splashing by.

It takes them a moment to think about the situation before they jolt into action. They don't know if this person can swim. It would definitely be bad if this person got swept away by the tide. The sea is dangerous, after all.

Lacking much of a presence, they instead opt to grab Chip by the arm, attempting to indicate that they're going too far out and should come back. How well this works is debatable.