is there a right or wrong choices?

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..i found this video clip about a father who loved his son so much..he is a bridgemaster and is responsible for the safety of the trains that will be crossing over the bridge..until one day, an incident happened, after he opened the middle part of the bridge to give way to the boat passing under it, he left his post for a second without realizing a danger, a fast approaching train is on its way to the bridge...to make the summary short, the son went straight to the bridge to connect the middle part of the bridge manually by pulling some trigger at the bottom of the bridge but accidentally, the kid went straight into the whole, down to the bottom part of the bridge..on that the same moment, the father saw his son and the fast approaching train on a top speed. He was left with one choices, to save his son and leave the train or to pull the trigger located on his post and crash his poor son's body for the sake of the train and the passengers inside it. he choose the latter one..although it is his fault why it happened, but if it were you, what would be your decision and why?...