Nobody was prepared to see Scott walk down the aisle
When he walked Elise down the aisle, it caught everyone off-guard. For over 20 years, no one had seen him walk. The disease had gotten him bad. So to see him walking his daughter in this special moment, it was enough to make everyone in the audience cry.
The only people who knew he was going to achieve this, or even attempt this, were family members. Scott had been perfecting his exoskeleton set-up for months prior to the big day. He had also been working extra hard on physical therapy to prepare.