He had honestly forgotten what it was like to be around teenagers or children. So many just wanted to pick his brain about very specific knowledge only he knows, it was exhausting. Kids just want to know about everything and teenagers ask the most interesting questions. People like Madoka make Lan Wangji actually forget how old he is.

He nods at the question, Madoka could be very powerful in her own right but her appearance makes her seem vulnerable and makes Wangji want to offer his aid. If only to repay the kindness she shown him thus far.
"I could not do it with more than one person at a time, nor for the longer gaps, which is why I have not broadcast my ability to do so. I can manipulate my internal force to strengthen my jump and project it to glide across. I cannot glide as far up as I can down, this place makes using energy more strenuous."

He half smiles at her, "You are free to ask any questions you may have."