Lecture 13: Global Illumination & Path Tracing (86)

Why does it say it is 'at each point on light path'? Is it supposed to be 'for each light ray'? I understand that we may use different sampling scheme for different light rays given different conditions (e.g. direct lighting and indirect lighting), but I don't understand that how we may use different sampling schemes at each point. Does it mean each reflection/refraction point?

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