Sponsors don't accompany people doing an amends. Ideally, the Step is worked with the assistance of a sponsor, who will provide guidance on how to do it. They always stress the part about "except when to do so would harm them or others."
And, really, a lot of people try to get out of attempting an amends on the theory that "it will harm the other person." Sometimes that is simply looking for an "out"--so usually, unless it really seems likely to cause harm, it is recommended that the attempt be made. If the other person says "no" that should be the end of it.