You shouldn't be in a situation where two creatures can trigger the glyph simultaneously anyways, since there's a marching order to exploration and the DM should resolve scenes in turns if there's a lot going on. But yeah, if the players went out of their way to declare that two characters are trying to do something simultaneously, the DM can just pick one.
You shouldn't be in a situation where two creatures can trigger the glyph simultaneously anyways, since there's a marching order to exploration and the DM should resolve scenes in turns if there's a lot going on. But yeah, if the players went out of their way to declare that two characters are trying to do something simultaneously, the DM can just pick one.
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The demiplane trick also works with a bag of holding and portable holes