Harry reaches deep inside himself, feeling after his magic. It’s there. Just a tiny little light still, but it’s there. He won’t be able to do much. Flexing his little flame, he summons the bone-like wand to himself. The object shrinks in his hand until closing his pudgy little fist can hide it completely. Even if he has to toss it aside once he gets to the Durselys, as long as it’s inside the house somewhere he can always summon it back to himself.