Gammon blinks, and settles down into his thinking position, once more. Almost five minutes pass, before he rises again. "Hypothetically, such an act would be impossible. The very act of transporting a being of your strength into the past as far as your propose would cause immeasurable problems in the time stream, as every single action you took would have multiverse-wide consequences. Assuming, however, that this could be mitigated... no. This would not, directly, cause  the problem. If you were to create a stable time loop, then it is preordained as such." He hesitates, then clicks three times. "I cannot provide information on such an event. Knowledge has been specifically withheld from this unit, regarding unusual time-space events between three hundred and four hundred years ago."