Final answer:
In this scenario, the defense of assumption of risk may not sustain due to the hidden defect of the hammer. The manufacturer can still be held liable for the injuries caused by the defective product.
Step-by-step explanation:
In this case, the defense of assumption of risk may not sustain. Assumption of risk is an affirmative defense used by defendants to argue that the plaintiff knew and understood the risks involved in using a product, but still chose to use it. However, in the given scenario, even though John continued to use the hammer after seeing metal chips flying off it, it was later proven that the hammer had a hidden defect. This means that John may not have been aware of the actual risks associated with using the hammer, as the defect was not visible.
Therefore, it can be argued that John did not fully assume the risk of using the hammer because he was not aware of the hidden defect. The manufacturer, V B, may still be held liable for the injuries caused by the defective hammer.
This is supported by the counter example situation provided, where a manufacturer is held liable for injuries and deaths due to known defects, even if the consumers were aware of the risks associated with the product.