Transcript for 'Taking the plunge' takes on a whole new meaning for a groom in Canada

Finally tonight here, the bride and groom in Ontario, getting their photos taken when suddenly, the groom is tested. This looks more like your typical wedding photo. Clay and Brittany cook, this weekend in Ontario. But this is what it soon looked like. That's the groom, soaked, nearly waist deep in the water. Clayton noticed a boy had fallen in, and without hesitation, left the photo shoot to save the boy. His face was under water and he was fighting, like, he was really fighting. Lucky he was only a little guy and I grabbed him, sort of like right here and I just kind of, I just sort of huffed him up. Reporter: It was just moments earlier, they had begun to take those photos when the photographer noticed the groom was gone. He was struggling to swim and he swooped right up the little guy by his arm, just sopping wet and the kid safely walking away while he's waist into the river. Reporter: That little boy, he's okay tonight. And so is the bride, saying, that's the guy I married. That's clay, like, that's clay to me. It doesn't even surprise me that that happened. It's something he would just instinctively do. Glad that little guy is okay, and here's to the bride and groom tonight. Thanks for watching here on a Tuesday. I'm David Muir. I hope to see you right here tomorrow.

This transcript has been automatically generated and may not be 100% accurate.