[The pursuit of the fish is noted, but not really reacted to. It made sense that she'd eat them, and without cooking for that matter. Fires didn't work well underwater.]

More or less. A guide will often only show the way. An escort, or in some places a 'guard' is much the same, will also offer aid and protection should the need arise.

[No, he certainly wouldn't offer if she was human. He'd more trail along to see if she might kill herself somehow on accident, if she were.]