-1I'm not sure how to space things correctly (i.e.: no clue at all), so this is how it's going to be. I hope you guys can bear with me.
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Both of them were completely surprised when the first few tanks cleared the embankment. Sarah screamed. Megatron practically jumped to his feet. "Get behind me!" His tone of voice silenced her objections before she could voice them, and so she merely darted behind his right leg as he got ready for a fight. The air was torn to fluttering shreds as a swarm of helicopters entered the area, at which point he opened fire with a cannon cleverly hidden within his right forearm. The helicopters scattered like a seven-ten bowling split as one launched what had to be a harpoon, the large and formidable spearhead cleaving the air to strike true and bite deep, impaling Megatron's right wrist and disabling the cannon momentarily. A low growl escaped him and he pulled on the line hard enough to throw the offending helicopter out of the air, what looked like a chain-whip taking shape in his left hand. A single lash of that deadly whip sent two helicopters plummeting from the sky in balls of flames, and the All Spark within Sarah could hear their cries. Several shots took out several tanks, aimed straight and true by an expert marksman. Backing off a bit, the tanks fired back. The projectiles they fired weren't designed to pierce or to explode; rather they were oversized pellets of liquid nitrogen. Bringing his right arm up to block, he winced as the shells impacted, liquid nitrogen going just about everywhere save behind him, and for that he was glad. He drew his whip back for the mightiest swing yet… and started in surprise as not one but three harpoons lanced his left wrist. He tried to pull free, but the combined might of three helicopters was enough to disable his whip and pin his arm there. A snarl erupted from his throat as he shifted his attention to using his right hand to rip the lines out of him… only to have three more harpoons strike his right wrist. Shock froze him in his place momentarily, just long enough for the tanks to fire another round. Now he was sure of it. They wanted to freeze him again, to take him back to where he had been before. "…N…no!" The liquid nitrogen was coating him, covering him, his external and internal temperature falling rapidly, just as it had the day he arrived on the planet… Just like before, his mind was blurring. The shots just kept coming, more and more ice forming, restricting his movements, trapping him… He was dimly aware that the human he had vowed to protect mere minutes before was charging out from behind him, dashing out into the open and entering the danger zone even as the assault brought him to his knees. It occurred to him that she was trying to intercede on his behalf.
Sarah stepped between Megatron and the Army as a whole with her arms flung wide. "Stop it! Stop hurting him!" She couldn't take it anymore, couldn't just hang back and watch someone fight for their life… "He wasn't doing anything!" The helicopters had joined in the barrage of liquid nitrogen and no one heard her. "Leave him alone!" Tears of profound rage clouded her vision just as much as the turbulence whipping her hair in her face. She could almost feel something building inside her, something called forth by her desperate anger, and had she bothered to notice she would have seen blue lightning crawling across her skin. "Stop it! Just…" With every ounce of strength in her body, her mind and her very soul, she tilted her head back and screamed. "…STOP!"
A storm of blue lightning erupted from her now shining body, licking tendrils reaching out to each helicopter, each tank… and in its wake, everything stopped. The tanks sat like lumps and the helicopters just hovered where they were. Behind her, dimly aware that things had stopped, Megatron opened blurry eyes to behold her shine. His sense of the All Spark's location was going crazy, but he didn't need it to know the origin and nature of the power being unleashed right in front of him. Sarah still shone like a star, and her voice, when she spoke, was more powerful and commanding than even his. "Stand down weapons." His sensitive hearing picked up the confused and irate cries of soldiers as the weapons systems in each and every tank and helicopter powered down. She looked up at the helicopters. "Disengage harpoons." Each and every helicopter that had participated in the attempt to tether him summarily cut their towlines. It was then that he understood that the All Spark could do more than give life and repair damage… What it offered was nothing less than total control over all things mechanical. "Return to base." More yells came from the Army vehicles as each and every one of them turned and left quietly.
With the barrage ended, Megatron's core temperature was returning to normal, his mental faculties sharpening once again. "Sarah?" She fell to her knees as the light began to die away to reveal her, and to reveal that she had… changed. The intricate designs that had once adorned the All Spark now covered her skin, delicate traceries seemingly made of solid blue fire. "What happened to me?" His armor clattered lightly as the last of the liquid nitrogen dissipated, but he stayed down on his knees. "You used a facet of the All Spark's power that no one ever dreamed existed… And it appears to have marked you." Looking herself over, she eventually giggled. "I always wondered what I would look like if I got a tattoo… Now I know!" What he didn't know, or couldn't tell, was that her giggle was completely forced. In reality, she was more terrified than she had ever been before. Her life just seemed to be going down the tubes. Perhaps she was losing her mind. Perhaps this was all just a figment of her imagination. Yes, maybe it was all in her head…