Question about restraining orders

So right now my brother has a restraining order on him and cannot be around his ex or his kids. His dad is very sick and he has been taking care of him. His dad also lives maybe a mile if not less away from the ex. My brother was at the store yesterday after taking his dad to a dr appointment and as he was leaving the store his ex was walking in and saw him. She made a comment to him and he just hurried back to his car where his dad was and left. Obviously he didnt know he was going to run into her and he really doesnt want to see her anyways but could that hurt him in anyway?