The referee called goaltending because the defender touched the ball while it was coming down.

goaltending 是由 goal（球门）和 tend（照料、看管）加上 -ing 后缀组成的复合词。goal 指"球门、得分目标"，tend 表示"照料、看管"。 goaltending 是篮球术语，指防守球员在球下落过程中非法干扰投篮的行为，中文称为"干扰球违例"。