The ring at least gives Vance a map of where everyone is. Which means that everybody else can see it. So he's not surprised to hear Ray shout for him by name.

While the map is good on the X and Y axis, though, it's not nearly as good on the Z. Not here, at least. Still, given power sets and everything, it's probably not surprising that Vance comes from the sky, aiming a few blasts of telekinetic force at some of the tentacles before wrapping a TK bubble around Ray. "I may actually be the only Legionnaire in the air at the moment. May as well take advantage."