Meanwhile, at the McMillan Tech labs ...
"Dr. McMillan, the data from the first test of the cloning machine has finally been compiled," Suzan's assistant said, coming into hir office. "It's ... not exactly as we thought."
"How do you mean?" shi asked, bringing the information up on hir computer. Looking over the data, shi realized what hir assistant was referring to. "We didn't bring Sarah and Biff into our world. They're just copies. We cloned their original selves from that dimension," shi said out loud, realizing how wrong shi had all of this.
"Exactly. We can't send them home because the rift we tapped into doesn't work that way. Besides, they already exist there. If we somehow figured out a way to send them to that dimension ..."
"Then there would be two of them there," Suzan finished.
"So, should we tell them that they're stuck here forever?" hir assistant asked.