"Everything is okay, yes, but that wore me out more than it should have. It's very subtle, but I've been feeling something was off for the last few minutes. My guess is that the magical field of Equestria is radiating slightly into Earth from the open gateway, but the further we go from it, the less magic we have access to. Since Applejack and Rainbow Dash's magic is mostly physical, they noticed the effects of it first. However, we should be careful not to go too far away from the gateway. I don't know what would happen." 