[rather than just teleport, Xellos rocks back to draw his knees up and catch the incoming assault with his feet, meaning to hold him at bay in such a way until other methods are devised.]

Well, wait a minute! This is just getting interesting! Does this mean you can't go out into the sunlight? Averse to garlic? Wood in sharpened states? Silver? Which old wive's tale fits the bill in your case, hmm?