Gwenog was watching the young man carefully, and she was starting to get concerned about his breathing. So instead of catching his next finger she did her best to look him in the eye, or at least the face, and said steadily. "Okay, I don't think you're breathing very well, so I want you to try and copy me," she said and began to practice slow, regular, but obvious breathing which should be easy for him to copy if he could. She'd been controlling her breathing in various ways for as long as she could remember, pretty much, so it was easy for her to make a pattern for him to follow.
The offer to speak English surprised her into a smile, which could be pretty tricky to do. She shook her head, continuing to speak in Welsh. "No, Welsh is my first language, but I'm not used to speaking it with other Wizarding people. Even most of the Welsh wizarding folk I know speak English first. Plus there's the fuckers who don't think black people speak Welsh." That particular fact had been the cause of a few amusing situations for her over the years, with people thinking they could talk about her behind her back because she wouldn't understand them.
"Ready for the next one?" she asked, the warmth of still being able to speak her mother tongue providing a light in her belly, and even more determination to help him. It was the work of only a few moments to straighten the next finger once he indicated he was ready.