See, this is how Seth knows Daniel absolutely wasn't fishing for any help. You just can't fake looking that completely taken aback. How surprised he is at just being offered a little friendly help. Given his situation, it's probably been a while...

He smiles and nods, pleased when Daniel accepts the offer. "Well," he says, looking back out the window. "It's let up a little bit. Don't think it's likely to stop raining completely for ages, so we should probably just go while it's not as heavy. Not like you can get much wetter."