The mention of 'hooves' gives him enough of an impression. A zebra must be similar to a horse or a halla. Trying to imagine either acting as a healer in any capacity is... impossible, to say the least.

"You have certainly found your calling," he says beneath his breath though he makes no attempt to hide his words. ANd because he's curious, he goes against his better judgment to ask, "How did a hooved creature manage?"