He was amazed at his ability to solve the problems as he came to them and not go to pieces, like Hooper did.

go 在这里是动词，表示"进入某种状态"。 to 是介词，表示方向或结果。 pieces 是名词，意思是"碎片、部分"。 go to pieces 是一个固定短语，字面意思是"变成碎片"，比喻"精神崩溃、失去控制"。