The scream through the door caught Isaac's attention, but in truth he was glad for the pause. He didn't really have a set rate for this sort of thing--outside of pressing business that required his direct interaction it was quite rare to see him outside of his house, let alone flying about on fucking airplanes. He'd been places, certainly, and been in enough places for long enough that he tended to know that it was a bad idea to begin with. There really were very few things that couldn't be completed via competent assistants paid heavily for their competence.<br/><br/>Then again.<br/><br/>There was something about working with Clara that made him want to continue working with her. He couldn't have put his finger on it, but he could certainly have said that he wasn't done with this particular case. Between the two of them they'd stumbled on half of something quite rare, and even if he never intended to use it there was always that moment of recognition when he saw quite how the spellcasters of old had bound such things together. He lived for improving on their designs--utilizing a Russian ancestral plea here to compensate for a lengthy appeal towards divinity there, accomplishing the same effect at a fraction of the time and effort. A metamagician, he worked directly on the magic itself, and as such even the most mundane of the objects she had here often captivated his interests for far longer than they should.<br/><br/>That being said, he had to charge<span style="font-style: italic">something</span>. He didn't want her thinking that she'd slipped past his guard entirely, and more importantly he couldn't keep digging into lost and exotic coffers for rent when he underestimated the cost of components again.<br/><br/>"My usual daily fee will suffice." He said simply, which was a joke--his usual daily fee was enough to pay rent in his shitty little apartment for a month, which left the rest of it available for instruments and reagents. And food, of course. "I'll accompany you insofar as my services are useful. Don't pay if you don't need me." he added, stupidly, and reprimanded himself for it mentally before striving to move on.<br/><br/>"I don't do planes, though." It took him a moment, and he coughed into his hand, but he had to let her know. "As an aside."