A promise and a declaration? That makes him blink a bit, because that's heavy in a whole different way. But a beginning is something he's just fine with.

'Ssh luv, it'll be alright.'

He's only walking them down to where the water is a bit less deep. Less likely to get pushed over while they...well. Whatever. He stops when the level touches the waistband, and pulls her close again.

'I'll ask around, see if there's a way to guarantee comin' back. I think someone said something to me once. I'll check, OK.'

If he can make it right, he will.