6. As soon then as he said unto them, I am He, they went backward--recoiled.
      and fell to the ground--struck down by a power such as that which smote Saul of Tarsus and his companions to the earth (Ac 26:14). It was the glorious effulgence of the majesty of Christ which overpowered them. "This, occurring before His surrender, would show His power over His enemies, and so the freedom with which He gave Himself up" [MEYER].

JFB.