The Flash Deals Barry a Devastating Blow
The first is that the Flash (Grant Gustin) was riding a hard-earned wave of confidence thanks to a pep talk from the Speed Force and Zoom popped a giant hole in his ego.
[...] Henry had only just committed to being a more present part of his son's life.
Instead of getting to build the father-son relationship that he and Barry deserve, Henry was killed just inches away from where Barry saw his mother murdered years before.
Zoom killed Henry to make himself and Barry equals -- two speedsters without parents.