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Four knights are preparing to duel. Each has a different weapon, and will start with it sheathed in his own corner of the square 10 by 10 meter chamber. Each knight moves 5 meters per second.

The Blue Knight has a straight sword that allows him to move twice as fast as the other combatants.

The Red Knight has a curved blade that can hit two knights at a time, provided that they are within 1 meter of each other.

The Black Knight has a wavy-shaped sword that kills anyone that touches its tip.

The Green Knight has a corkscrew-shaped sword that makes himself invisible while it is sheathed.

Who will lose this battle?

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Hopefully wrong answer

This feels like a trick more than a puzzle, if the following is the intended answer: perhaps

the black knight will lose

because

you can't extract a wavy sword from a similarly-shaped sheath.

But

perhaps the sheath is actually (e.g.) wedge-shaped and the sword goes in and out of it easily. (A real sheath for a wavy-shaped sword would be designed that way.)

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    $\begingroup$ You are correct! This was a rather simple puzzle, and you got it real quick! $\endgroup$ – TheCentaur May 8 '19 at 1:25
  • $\begingroup$ And there's no guarantee that they need the sword to win. $\endgroup$ – Acccumulation May 9 '19 at 18:04
  • $\begingroup$ Hard to see how they have a real chance without it. $\endgroup$ – Gareth McCaughan♦ May 9 '19 at 18:06
  • $\begingroup$ But they can block even with the sword sheathed, right? And perhaps parrying a blow will unsheathe the sword.. $\endgroup$ – justhalf Jul 8 '19 at 17:45
  • $\begingroup$ How would it do that? The problem is that it physically can't slide out of its sheath. $\endgroup$ – Gareth McCaughan♦ Jul 8 '19 at 18:57

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