After Nevin had realized that Felicity had fallen asleep against him, he had grown concerned, until he figured out that she had fallen asleep due to the lack of anger hormones being actively released into her system. Just how long had she been operating off of nothing more than a thinly veiled anger making her blood pump?
So, concerned about her, he couldn't exactly just throw her out into the street. He had closed down his shop and carried her down into That had been awkward for him - because it meant he had to use his threads to do so, carrying her almost like a doll above him so that he didn't accidentally slam her into the floor because he couldn't see where the end of the ladder was. Thankfully she hadn't woken up tangled in the crimson tendrils, because that would probably have made her freak out enough to overcome the medication he gave her.
After he had gotten her down, Nevin had gently laid the girl on the cot in the corner of the room and gotten to work. One of the vials of her blood was unstoppered and he pulled it out, letting it swirl in the air around him as he tried to think of how to approach this situation. And then he noticed something that made his concern for the girl skyrocket.
Even with his doing nothing to the blood, it was thick, almost sludge-like. It shouldn't have even been capable of flowing, it was almost like a paste, not the fine free-flowing fluid it should be. He immediately began running a few tests on a small sample he drew frequently the test, and his fear was concerned.
Whatever her power was, it was certainly having a physical reaction on her body. Stress hormones were running rampant in her blood, clotting it up so much even inside of her that it was a shock that she was still on her feet. In fact, with this much blood, he was astounded she didn't suffer anemia or something along those lines.
So, in addition to figuring out how to handle the actual unknown serum, he would have to help her with this immediate problem. Her blood being this thick was distinctly unhealthy. He could, he thought change the density of the blood directly - experimenting on the blood in the air around him proved that - but. But, if her system had adjusted to having essentially a blood syrup instead of what it should have, then that drastic of a change might actually affect her even more adversely.
So, it would have to be done slowly, over time. Which meant, a medication. Luckily, he happened to be in just such a business. Quick strides carried him to his cabinets, and he began pulling ingredients out. Some were discarded, too much risk of adverse effects with the unknown serum, others were set up, ready to go. So he began, grinding, mixing, boiling and skimming, slowly concentrating the concoction down.
The finished product was a batch of seven pills - with another set of six hardening in their 'candy' coating. Six for her to take over the next day, one for study - then another batch of six for the next day. While he waited for her to wake up, he began spinning her blood around his head, listening to the angry choir pounding in his head.
So, the chemical serum was creating an artificially induced stress reaction inside of her. That prompted the increase in anger, which created more stress, more hormone... It was a self-perpetuating cycle. One that he had cut off before it could run its course - no wonder her body had crashed, it was used to an escalation in stress once it started, and he had essentially cold-cocked it in its warm up stage.
Well then. He began work on his next idea. A low level hormone blocker - it wouldn't prevent their generation, so when the reaction happened she would still have that additional burst of anger - but hopefully it would prevent her system from absorbing those chemicals and beginning that perpetuating cycle.
Felicity thrashed on the cot in the corner of the room, trapped in the throes of what Nevin could only assume was a nightmare. He dared not wake her though - not yet. He knew full well that if he tried, he would probably get a cracked rib from a frightened teen lashing out. He scooped up the medicine and put her blood back in its vial, and moved over to her. Thankfully the hormone medication could brew for a little bit without his direct supervision.
When he gave her the pills, it she had stared at him blankly for a moment before her eyes widened in recognition. He repeated himself to answer her question.
"Blood thinners. The serum creates a stress based hormone reaction, one that has thickened your blood to an almost absurd degree. There's a chance that the reason you haven't been able to tap into your magic is because it is funneling itself into keeping you going when your blood more closely resembles a salsa than a wine."
