Everyone has to behave
When Lex returned, the fairies were still unconscious. How long did it take to recover from a cross generation enchantment that kept them and their entire race cursed? Since he didn't have an answer to that question Lex was about to throw drops of his blood on all of them, when he suddenly paused.
Perhaps throwing his blood around everywhere so casually wasn't the best idea - since he was trying to hide his physique. But he had to admit that its healing qualities were extremely handy. Since that was the case, he just had to learn another healing technique.
"Hey Pel, do you know any healing techniques?"