When he saw him — When the child saw Christ; when his deliverance was at hand. Immediately the spirit tore him — Made his last grand effort to destroy him. Is it not generally so, before Satan is cast out of a soul, of which he has long had possession?
Related Commentaries of Mark 9:20
Mark 9:20
20 And they brought him unto him: and when he saw him, straightway the spirit tare him; and he fell on the ground, and wallowed foaming.