Hunter isn't a physical receiver.... its very common for a receiver like him to go down early to avoid contact because that stuff takes a toll on their bodies over the course of a season. Why risk it to get injured on something stupid to gain maybe 1 more yard?
This. Players in the pros do it all the time. It was actually taught by my receivers coach. There's no sense in taking a kill shot and being out of the game in order to get another yard. It's the same principle of an option QB that is instructed to "give with the pitch."