Helena was going to let Claudia handle the fictional people thing for the moment. Now was obviously not the time to tell Myka they were fictional as well. Besides, Claudia was better at explaining the fictional thing given Helena was still catching up on the subject. She'd seen Star Trek, at least some of it, so she knew who those characters were, but she had yet to see Star Wars.
When Myka revealed the point in time she was from, Helena clenched her jaw, briefly casting her eyes towards the ceiling in a "curse the heavens" type of move. Of course Myka would be from after the Astrolabe mess. Which would only make Helena explaining the point in time she was from that much harder because to Myka, she had never died and the Warehouse had never been destroyed. Helena silently cursed the Astrolabe, quickly followed by a curse directed at Sykes.
"People from the same place can be pulled from different points in time. You are from a point ahead of Claudia and I." Which was where Helena was going to leave the subject for now. She didn't need to blow Myka completely out of the water by telling her in another timeline the Warehouse was destroyed by Sykes. That was very much a revelation for another time.