Aisling holds her hands palms out towards the human and calls on the healing spell. She has used it on animals and various non-fae beings before, so she's reasonably sure it should work. It's a general healing, working through the being's system to give a temporary boost towards healing whatever the body says needs attention. She doesn't know exactly the details of it, she just knows it can help stave off bleeding out of minor cuts, and keeping muscle tears and strains from interfering with her ability to get the job done. The human isn't mortally injured, so the light healing should do quite a bit for him--lessen the pain, knit some of the flesh and skin, enable him to move about, even if he might be still slightly sore and scrabbed.
For more severe injuries, it has helped her get to a healer before she died. She hasn't had too many close calls; she is good at her job... well, her old job.
Dark fae are usually somewhat blood-thirsty in general, but these Tavern-travelers are fortunate that she has had more than her fill of blood-letting and has lost her taste for it... mostly.