The coach likely told Victor to “tag-up” however, once Victor saw that it was a strong throw towards second base he should have stopped and returned to first base. These guys are Big Leaguers and you should not have to hold them by the damn hand. If the play is in front of the runner as this was, it is 100% Victor’s decision. If Victor returned to the bench then told me, “the 1st base coach told me to go” I would still hold Victor responsible.
That said, Victor was just trying to help his club win the game. Unfortunately this was a painful choice and learning lesson at this stage of his career. Ouch!