The Champion feat Shield Warden allows a character to use their reaction to shield an ally. The feat says:
... When you have a shield raised, you can use your Shield Block reaction when an attack is made against an ally adjacent to you. If you do, the shield prevents that ally from taking damage instead of preventing you from taking damage, following the normal rules for Shield Block.
Emphasis mine. What isn't clear to me is who takes damage when I use Shield Warden, me or my ally. The text says it uses the normal rules for Shield Block, which say:
You snap your shield in place to ward off a blow. Your shield prevents you from taking an amount of damage up to the shield’s Hardness. You and the shield each take any remaining damage, possibly breaking or destroying the shield.
This is unhelpful, because "you" refers both to the person taking damage and the person using Shield Block.
So who takes damage when I use Shield Warden: me or my ally?