He winced as the girl began to cough, but things were moving so much faster than he'd ever expected and he simply filed away what he would need to do once there was a moment to, no pun intended, breathe. She gave her consent to be touched and Crux quickly moved to wrap himself around her, laying down behind her and curling his bulk around her absolutely minuscule frame, he made sure his thick pelt was kept clear of her face so nothing else could impede her breathing. It was an almost protective move, and he couldn't help but feel like it was uncomfortably paternal. But keeping her warm would hopefully help. He still wished he had tea or something, no doubt her throat was raw and she was probably dehydrated but the water from the falls would only risk starting a whole new fit at this point, chilled by the oncoming winter. So this was the next best thing.
"Okay breathe with me." He instructed and again began to breathe deeply, in through his nose, out through his mouth. Hopefully it'd be easier for her to regulate her breathing if she matched his own, and it would have the added benefit of helping to calm her if so. He just hoped she'd get the hang of it before he got light headed himself. He could see the other side of this though, he intended to stay with the small girl until she was calm enough to breathe or... Well if she passed out then he supposed he knew how to help her there to.