Chase had to bite his tongue to keep from lashing out. he forcibly flattened his expression so that whatever frighteningly angered expression had been there wouldn't scare the girl. he stopped when he heard her trip. "can you just...shut your mouth and THINK for just one second?" he said as calmly as he could manage, then turned around and walked towards her. he grabbed her by the back of the shirt and yanked her back onto her feet. "i told you, if you aren't hired and aren't on the clock, my employer can get in trouble for allowing free labor when we are not a volunteer business, any smart mature citizen would know that." he sighed, "i have no control over you following me, i can see that now, so do as you please, but if you make me lose my job and cant pay my rent, i promise you there will be consequences" he said, clenching and unclenching his fists. he was usually very patient, but this girl either had no knowledge, or otherwise disregard for how employment worked.
(i would say that Chase is being a jerk, but this his more of him being realistic...his jerk side is usually more hurtful or just shrugging off everything.)