In the movie Batman v Superman: Dawn of Justice, the spear Batman made with kryptonite, sometimes glows and sometimes it does not. Why is this?

There is a scene with Batman holding it when he has Superman pinned down, it was glowing. There is another scene/scenes where Lois was holding it and it didn't glow. Then there are scene where it was faintly glowing. Why?

  • Maybe because it's inspired from Radium Jul 1 '16 at 8:10

As seen in Smallville, raw Kryptonite glows when in proximity to Superman, It is likely that it glows faintly when he is close but not too close. When Batman has Superman pinned down the spear is right near his face. When Lois retrieves it, superman is nowhere near. I am not sure how consistent this is with other sources but I know that in Smallville at least that is how Kryptonite glowing works.

  • They named the glowing spear "Sting".
    – iMerchant
    Jul 2 '16 at 3:51
  • Would it be fair to say it glows near a Kryptonian?
    – Huangism
    Jul 4 '16 at 13:13
  • @Huangism yes, I suppose. Jul 4 '16 at 21:35

This Kryptonite gains superior cutting when energized by an outside power source. The Kryptonite glows brightly under the following instances:

  • As a scalpel in the USAMRIID footage.
  • As a scalpel wielded by Lex harvesting from Zod.
  • As a spearhead drawn from the ground by Batman.
  • As a spearhead under the rubble under the water.

The Kryptonite does not glow or glow brightly under other circumstances, including but not limited to the fragment in the box being shown to the senators, the spearhead plunged into the ground, the spearhead when forged, etc.

Something unifies the above tool uses. In every case, the Kryptonite is connected to a complicated scifi handle. Scalpel handles are simple and don't have triggers or cables coming off them, but they did in the above examples. Batman trained Robin to use a pole-weapon which is relatively straight-forwards, smooth and featureless, meaning they prefer standard simple shafts. Yet the shaft of the Kryptonite spear is incredibly complicated and technological, covered in flanges, flares, fins, rivets, ridges, rings, and reliefs… like a lightsaber… a weapon hilt which we know does more than simply act as a handle. This idea reinforced by Zack Snyder tweeting out an image of Henry Cavill clutching the spear-shaft with a red lightsaber blade emanating from it.

Additionally, when Batman draws the spear from the ground, it expands in two stages with a satisfying "Ka-chink!" sounds, indicating it has user-operated buttons or functions which allow Batman to expand the spear. If there are buttons or triggers to do that, then it's quite reasonable that there are buttons or triggers to power-on the spear. Just like there is a trigger for the kryptonite scalpel. If there is a button or trigger, then there is something for the rubble to hit or set-off when the spear is discarded off, but recovered on.

Why would kryptonite be better at cutting with energy in it? There's various precedent in real-world science, whether in ionizing a radioactive material or sending a cauterizing laser through a diamond crystal blade.

For more on the nature of Kryptonite in Batman v. Superman, Episode 44 of the MOSAIC podcast is all about the Kryptonite spear.

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