Extend the Story - Add a Room

Okay, that gate should be here, it's supposed to be here, right between nine and ten... You walk toward the pole between the two regular gates, slowing down, just a fraction toward Gate Ten, at the last minute you empty your thoughts as this always seems to help...
And then it's the most natural thing in the world for the pole to shift perspective, and there's now the full gate and everything. You did it! but then of course you could, you're a witch. Okay, now to get boarded.
"Where are you? Where'd you go?" comes your father's voice behind you. "Over here, Dad! Can't you tell?"
"Where? I don't see you."
"Here, in front of the train, you can't miss it." What on earth is the matter now? Are your folks going to embarrass you by showing themselves as complete fools even before you leave?
"What? I don't see any train?"
"Just walk toward the pole, it's right behind it." Oddly, you keep hearing your father but can't quite see him; it's like he keeps staying in the tail of your eye. Now what?
"He can't find you, Gate 9 3/4 isn't visible to Muggles," says a new voice.
You turn to see the speaker, a boy with glasses, and look for your folks.

You speak to the stranger