And often it has thrown him both into fire and into water to destroy him. But if you are able to do anything, have compassion on us and help us.” Bible other translations

“if you are able to do anything.” The man obviously knows Jesus can do some miracles. The question he is asking is “Are you strong enough to fight this spirit and cast it out?” After all, he said the disciples were not strong enough to cast it out.

Commentary for: Mark 9:22