How does this work?
This strategy has multiple names like Oneshot, Divide By Zero Cycle, and Dragon InstaKill. A simple way to explain this is the dragon causes knockback on the player. This knockback in extreme cases can accelerate an arrow over 400 b/s velocity. Since arrow damage is correlated to its velocity, this is enough speed to kill the dragon instantly if done correctly.

Here are some videos to better explain this. (Both by Curcuit)
[   • Server Death by Infinite Dragon Knock...  ]
[   • Dragon InstaKill Test  ]

Seed: [2984198431426858954] (Clock Seed 1.16.1)

Song: [   • VVVVVV Soundtrack 07/16 "Positive Force"  ]

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