(you can hear this, because...) he said in Ciaran's head, pausing to make sure he was explaining it properly. (until now, nobody's spoken to you like this. It's a bit like you have an extra back door in your house that you didn't know about, so how would you know you needed to shut the door?) He added an image of Ciaran's kitchen which now had 2 back doors, one of which - the new one that Dan had added - was lying wide open. And then Dan looked in through the open door, looking like his usual self and not his dad, and waved.
"Anyone that knows where that door is could just yell in. Do you see?"