INDIANAPOLIS -- Derrick Henry's stiff arm is one of the most violent moves executed on an NFL field since Deacon Jones' headslap.
Indianapolis Colts free safety Julian Blackmon — all 6-foot, 187 pounds of him — knows just how devastating a blow from Henry can be.
He's seen teammates get rag-dolled by Henry in the open field and he's getting fired up talking about what it takes to stop the Tennessee Titans' two-time reigning rushing champion.
Blackmon said the key to avoiding the stiff arm is to slap it down when he strikes and hold him up long enough for teammates to rally and gang tackle.