'Tillotson's invention is a device that would heat the air in front of the spot where the bomb goes off. In one version, a detector "sees" an explosion before the shock wave hits. The detector is connected to an arc generator, basically two ends of a circuit connected to a large power source. When the system generates enough current, an arc of electricity jumps between the two ends of the circuit, like a bolt of lightning.
That arc heats and ionizes, or charges, particles of air. The heated air would work as a shield by changing the speed at which shock waves travel, and therefore bending them around a protected soldier, Tillotson said.'