I have a similar Rhodesian Ridgeback story. Hazel my 90lb RR was probably the most intelligent dog I have ever had. I had a boy who worked part time at my brother vet clinic doing some work around my yard. I had not introduced Hazel to the kid because he had bathed her at the clinic so I didn't think it was necessary.
I miss Hazel. When Hazel first saw him walking across the back yard she took off after him and held the back of his thigh in her mouth (gently) while she cut her eyes to me asking what she should do with him. I called her to me, she let go of him and then stayed between me and the boy for the rest of the day. He knew enough about dogs, not to run from her.
*Never* run from a Sight Hound....ever.
You will not win.
;D