Disclaimer: Fringe still not mine. :(
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As Olivia moved around staring at empty air, with a frown of concentration on her face and with her hands glowing faintly, Peter watched her from the distance. She was clearly working on something unseen and he was not about to get in her way. He took in her red hair, the utilitarian clothes, the strange tattoo on the back of her neck and the now redundant ear piece she was still wearing. She looked foreign and yet so familiar at the same time and he felt a sense of sorrow settling over himself.
Peter's dark thoughts were interrupted when he heard his father's voice behind him and he turned to see the old man approaching with Astrid in tow. Walter's face lit up when he spotted his son and he nearly tripped on the chunks of amber littering the ground in his haste to get to him.
"Peter, son, did you see the explosion? Magnificent! We watched from the helipad on top of the Massive Dynamic building and the noise really was something. And this gas that has turned amber, it looks fascinating. Astragalus, we must collect samples to take back to our lab. I'm sure we can figure out the chemical composition and replicate the process. And once our agent Dunham has finished sealing the rift, she can no doubt provide us with a wealth of information on how this gas works and how she used it against the shape shifters." Walter would have continued rambling on, had Peter not interrupted him.
"Walter, how do you know what agent Dunham is doing and even that this woman is our Olivia?" Peter's question elicited an exasperated sigh from his father.
"Son, use your considerable intelligence! That Olivia over there is clearly using her abilities to heal the tear Walternate created to transport all those shape shifter and that machine to our side. The Olivia from the other side was never treated with Cortexiphan, therefore she would not be able to see the damage Walternate caused, let alone be able to do anything to fix it. Therefore, logic dictates that this is our Olivia and the person that we have been working with for months was in fact the Olivia from the other universe. Oh dear, poor Olivia…" Walter's voice faded away as he turned to look at Olivia.
While the Bishops talked, Olivia had finally knitted together the edges of the tear. The air had stopped shimmering and only the still smoking remnants of the machine were glimmering faintly. The glow from her hands died away as she turned to see her old team all watching her. She gave them a tired smile and moved to walk to them, only for her left leg to give away. Olivia frowned in confusion as she looked at the pool of blood that had formed where she had stood and she felt the exhaustion from pushing her powers to their limits and beyond wash over her in relentless waves. She stayed on her knees as the others rushed to her and she could hear Astrid offering to drive her to the hospital.
"No! No hospital, please. Walter can fix me back in his lab, can't you Walter?" Olivia looked up at the older Bishop, fear and desperation warring over her features.
"Of course, my dear. I have wonderful new sedative I have been working on, which I believe you will find most comforting. Asterisk can drive us back to the lab, can't you?" Walter seemed inordinately happy that Olivia preferred his care over that of mere medical doctors.
Olivia let out a sigh of relief and pushing against the blood stained road she attempted to rise to her feet. She got half way up before her strength abandoned her and she would have fallen back down had Peter not caught her.
"Easy there, Olivia. I don't think you can walk." He held her close enough to inhale her scent and then shifted his grip so that he could pick her up. She held onto his coat with both hands as he carried her to Astrid's car and gently lay her down on the back seat. While Astrid applied a quick bandage on Olivia's leg to slow down the bleeding, Peter walked around the car and got in on the other side, lifting Olivia's head so that it ended up resting on his lap. Walter got in the front with Astrid, who started the car, glad to leave the rest of the clean up to the other FBI agents who were now crowding the explosion site.
Olivia was asleep even before the car moved and she slept the whole drive to Boston. Everyone else in the car stayed unusually quiet, clearly wanting to let her have the rest she so desperately needed. Peter spent the journey gently stroking her hair, still reeling from the implications that this was their, his Olivia. For the moment, however, concern for her wellbeing overrode the darker thoughts of what his actions over the past months might mean for their future.