So, in the original Legend of Zelda, you know how when Link is at full hearts, he can shoot out the light beam sword? The energy sword weighs zero and is always moving. Not that you can, but if you caught it in your hand it wouldn’t weight anything. But even though it weighs 0, it still does damage and shoves enemies around when you hit them with it, just like things that actually do have mass in game, like his real metal sword, boomerang, arrows and bombs.
Light photons are kind of the same way!
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