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Phineas stops becaue it's the right thing to do. He is a Quaker. When he gets back to Phineas' home, he will be well taken care of.
"Well if I hadn't thee would have pushed us down, thee sees," said Phineas, as he stooped to apply his bandage. "There, there, -- let me fix this bandage. We mean well to thee; we bear no malice. Thee shall be taken to a house where they'll nurse thee first rate, well as thy own mother could."
Uncle Tom's Cabin/ Chapter 17