The sense of loss broke through Peter's numbness and nostalgia enough for him to make an instant decision - the younger Evey wouldn't be here for several minutes more - she was stopping someplace, and he had plenty of time. That established, Peter shut his eyes and focused on the older Evey, the one in the TARDIS. The one who was trying to brace herself for the fact that Peter himself was beyond her reach.
Which was simply not true. If he could reach her mentally, he was never more than an instant away.
Proven immediately when he teleported to her side and wrapped Evey in one arm, Leeloo in the other. "I'm here," he said softly. "We've moved. I don't... I don't understand it, but the entire island has moved. And I was moved someplace else. But still here. There's a city close by..." He started to explain what he was being told from the other conversation he was listening to.