With this two of the boxes shot back to the shelves leaving only one wands left "now you see Heir Potter, another explanation for the recurrence of wood types and core within magical families would be the exposure theory, the idea that if a young child is exposed to a wand over and over again there magic will be shaped by said wand and want a similar one, you young Potter were greatly exposed to another wand in your childhood" Ollivander's eyes flicked upwards to Harry's scar, "I am sorry to say I sold the wand that did that, the wand that did a great number of many terrible things. Thirteen and a half inches. Yew. Powerful wand, very powerful and in the wrong hands... Well you understand better than most what the master of that wand did"