Breathing fire on the grave

A stray bullet kills the kid. The dad is shot in the throat, losing his ability to speak. He wallows in misery and drowns his sorrow in booze until he finally realizes he's seen Death Sentence and all the John Wick movies. A revengeful action must be executed at all costs. Within a few months of self-training he's a bad-ass killing machine and the people responsible for the death of his son are soon to be dead. Silent Night is John Woo's misfire.