. >> police sarge yenlt was expecting a quiet monday morning on bart on wait into san francisco withhis fiancee to get their marriage license until a woman was being robbed on their car as that he approached the station. >> we turned and see a scuffle going on. tell meeg don't get involved. >> guilty. i told him not to get involved if it was under control. it was not under control. he jumped into action. >> i came closer and said listen i'm a police officer get on the ground. and i grabbed her arm. >> it sounds like it's out of a action film it and very well could be. sargeant coto's father is actor from "alien" and "midnight run". >> i threw them down and put them in a hold. >> he held the robber until bart police took 31-year-old jennifer davis into custody. davis being charged with a count r count of robbery and her probation, revoked. the 48-year-old victim left with her purse. >> the woman and i hope she sees this. she came and thanked me so sincerely so. nice to be thanked that way. so then, then, the sargeant was asked to stay to give a report. >> we had a prepaid appointment