[He's doing his very best to not look utterly amused by these turns of events, really-- relieved he's okay and not hurt and, uh, apparently in a boat.]
[Sits down on the branch he was walking on between treehouses as Keith approaches, holding out his foot to stop him gently one close enough, steadying the boat for him.]
Everyone's fine. [As fine as they can be, at least, but he knows Keith will understand that's what he means.]
Looks like you've... [uh] found a boat? [He's VALIANTLY trying to fight back the smile and failing.] That'll be helpful.