Are You Saying You Have an Allie on the Other Side?

In the book, gondor asked for aid and just lit the beacons as gandolp and pippin show up waways. So what happens if it works that way? And you're like, o snap. Both people think they need help at the same time. Well, considering in the book, this has happened like once since the dawn of time, i think your chances are pretty slim there. Don't know, have the eagles come and solve it. That's what usually happens.