In Luke, what did Jesus do after a disciple cut off the high priest's servant's ear?

Answer: Touched the ear and healed it

Jesus said, "No more of this!" and he touched the man's ear and healed him.

“And one of them struck the servant of the high priest, cutting off his right ear. But Jesus answered, “No more of this!” And He touched the man’s ear and healed him.”— Luke 22:50-51 (BSB)