He's well aware Lambert would rather keep fighting and he's no doubt capable of handling it, but the book's victim is down for the count and he has... a wind spell. That's about it. That and turning into a big freaking bird monster, only he doesn't think the denizens of the story would enjoy that.

"I don't need long," he answers, already having pulled Lambert along to the man's side. He crouches down, reaches for him as well, and then pulls on all the shadows the night has provided to get them out of there. Naturally, the man starts yelling in terror again when everything goes dark, but then they're spat out again closer to the village, putting them nearer to where there are torches lit and less where there are monsters lurking.