@hankgreen B is right. From the portals reference frame the people are moving towards it. The portal has no way of knowing that from 'our' perspective it is moving. A would imply a universal reference frame. Basically A is Newtonian and B is Einstein's relativity
@moonyriott B is right. From the portals reference frame the people are moving towards it. The portal has no way of knowing that from 'our' perspective it is moving. A would imply a universal reference frame. Basically A is Newtonian and B is Einstein's relativity