Meet the Texas-based church security business training worshippers to fight back in mass shootings

KRUGERVILLE — Liberty Hill resident T.J. Wagner yelled commands at his friend James Johnson in an empty classroom at a building in North Texas earlier this month: “Face the wall! Feet apart! Hands behind your back!”

Within seconds, Wagner handcuffed Johnson, leading him out of the room with one hand gripping the metal cuffs and the other squeezing his right bicep to guide him out. Then, the two switched places and it was Johnson’s turn to detain his buddy.

The pair were among a group of several men from across...