If Reed is a 100th turn Tesilid, and the current Tesilid is the 17th turn, did both of them met Ailette before the turn??
Yes.
Both Reed and Tesilid remember Ailette and also remember she was around for only one turn. That's why the save point that allow them to return to a specific point was so important.
If Reed is a 100th turn Tesilid, and the current Tesilid is the 17th turn, did both of them met Ailette before the turn??