According to Orlick, why was the attack on Pip’s sister Pip’s “doing”?

Orlick admits he was responsible for the attack on Pip's sister.

"I tell you it was your doing,—I tell you it was done through you," he retorted, catching up the gun, and making a blow with the stock at the vacant air between us. "I come upon her from behind, as I come upon you to-night. I giv' it her! I left her for dead, and if there had been a limekiln as nigh her as there is now nigh you, she shouldn't have come to life again. But it warn't Old Orlick as did it; it was you. You was favored, and he was bullied and beat. Old Orlick bullied and beat, eh? Now you pays for it. You done it; now you pays for it."