WOW! this is one of the most creative yet. The emotion evoked from the surprised son caused me to think forward to the resurrection of absent loved ones. On that day, the apostle Paul reveals in 1 Corinthians 13:12 that we will be known “then and there” in the same way that we are known in life “here and now”.
The emotion of tears and joy experienced by the son on the 50 yard line is just a minute “taste” of that to be fully enjoyed on the final reunion day by all the saints of God!