Kyran's pupils dilated. He knew in that instant that he fell to The Emperor's trap and trying to escape unscathed was impossible.
He could warp, yes, but he needed to focus his thoughts to a place he was familiar with or had been to before he could do so. Not only that, his magic energy consumption would depend on the distance of that place.
Previously, when he went to Somuli, Kyran had to warp at a nearby plane he had been to to get there. Even then, his used up almost all his magic energy. Fortunately, he did not pass out after that.
Another thing Kyran had to consider was his current location. He had an inkling he was already way outside the range of the planes he had been to. It was for this reason that he could not warp to the Human plane immediately. He needed to make sure if his magic energy was sufficient to make that long-range warp.