"If you don't let us in, I will tear your shields down, and we both know how long it takes to rebuild them," Harry told him calmly. There was no maliciousness behind the statement, merely information. Reluctantly, Severus let go. He expected the Dark Lord to take advantage and dig deeper into his mind, but his master held him back. "We are here to learn, Tom. Leave Severus" memories alone. They are mine now. We had an agreement."