Upon seeing Princess bloodied and injured, Willow winces. That is one hell of a wound and her work is cut out for her, and even though she can do it, it's not going to be something the fairy or her will enjoy.

"Keep him as still as possible, DON'T let him go!" She barks to the prinnies, then softens her voice before speaking to Princess as calmly and soothingly as she can like she's done to feral beasts back home. "Princess... It will be alright, I'm not going to hurt you, I just want to help you and heal those injuries." Softness before any forced action, she doesn't want to piss him off further.

She shows her hands, now emitting a warm glow and soft tendrils of light creeping very slowly towards the clefairy as she gives a sympathetic look to him. If he hits her with the blast, she can take it and won't hold it against him.