Question

Joey had been winding up to pitch when Gramps called for a time out.

Answer 1

Here is the answer to the given question above. Based on the sentence above, the tense of the underlined verb reveals about the subject that the event took place in the past continuously but concluded prior to another past event. "had been winding up" is considered as a continuous action in the past. Hope this answers the question.

Answer 2

The event concluded prior to another past event.