Guy surprises mom in Rome doesnt get the reaction he expects

Noah and his brother tried to take their mom to Rome. Noah told her that he couldn't make it. Witohut telling her he decided to show up and surprised her in front of the Colosseum. Right before he surprised her, she had a run in with someone that was aggressively trying to sell her bracelets which put her on guard. Noah comes out in a black jacket hoodie and says hi to his mom and puts his arm around her. She says oh christ hello you scared the crap out of me. She stops for a second and then reacts surprised because she didn't realize it was him at first. This was not the response he expected to get.