What was ghost reaction to his treatment by Mr Otis and twins on theit first encounte?

For a moment the Canterville ghost stood quite motionless in displeasure: then, smashing the bottle violently upon the polished floor, he fled down the corridor, moaning , and emitting a green light. Near the top of the great oak staircase, a door bursed open and two little white-robed figures appeared, and threw a large pillow at him.

really shocked