The Paradox Factor

"I asked, will it be safe enough for human testing.", the woman with the purse asks again.

"Yes, eventually.", you continue. "With the neural screener fully activated, all of the subjects future memories will be blocked. When we release all of the memory blocks, the subject will experience all of his memories, past and future, instantly."

Bill breathes a sigh of relief and smiles encouragingly at you.

One of the six well-dressed people across the table from you asks, "Okay, so the subject instantly lives all of his memories at once, but then you reblock his memories, how does this allow him to time travel?"