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Knight & Dragon puzzle

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This is a very famous interview puzzle, and has also been asked in Trilogy interview.

argaiv1060

There is a knight and dragon, living on an island. There are seven poisoned wells on the island, which are numbered from 1 to 7. If you drink from a well, you can only save  yourself by drinking from a higher numbered well. The well which is number 7, is located at the top of a high mountain and only the dragon can reach it.

One day they decide that the island isn't big enough for the two of  them, and they have a duel. Each of them brings a glass of water to the duel, they exchange glasses, and drink. After the duel, the knight lives and the dragon dies.

Why did the knight live? Why did the dragon die?

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