The pause there is because he has to think about how to do this. It can sometimes be enough for him to just wish things to happen, but his magic is unpredictable and he wants something more solid, something that it can't misinterpret. After a moment he leans over and makes sure the injured man is looking directly at him, holding his face still. What he finally says is not in English, and he doesn't intend to be understood by anyone, so it's not translated; it could be anything.

It's not that interesting, anyway, it is not actually a spell, just the focus for one. A nursery rhyme is the most natural focus he can think of for this -- it makes it easy to wrap the magic around it if they relate to each other in some way. Sleep is an easy impulse, particularly considering how exhausted the man was already, but he's in a lot of pain and it takes a while to get past that.

Finally, though, he's still, eyes closed, breathing even rather than laboured.

He leans back then, face drawn from concern rather than effort. "Is he... you think he's going to be okay?"