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Beetee is still messing round the tree, doing I don't know what. At one point he snaps off a sliver of bark, joins us, and throws it against the force field. It bounces back and lands on the ground, glowing. In a few moments it returns to its original color. "Well, that explains a lot," says Beetee. I look at Peeta and can't help biting my lip to keep from laughing since it explains absolutely nothing to anyone but Beetee.

Suzanne Collins (2010). “Catching Fire (The Second Book of the Hunger Games)”, p.363, Scholastic Inc.
Beetee is still messing round the tree, doing I don't know what. At one point he snaps off a sliver of bark, joins us, and throws it against the force field. It bounces back and lands on the ground, glowing. In a few