His spatial coverage wasn't enough to observe the trajectory of the time rays from a distance. By the time he detected their path, they were often dangerously close. And the speed at which the time rays moved defied description—it was not just "fast." Their force was akin to a hand wielding a brush, instantly sweeping across everything in their range.
Many players had died under the time rays.
Although the rays couldn't truly kill, anyone struck by one would freeze in place, locked in the same posture as when they were hit. Whether others tried to pull them or debris fell upon them, the person would suddenly crumble like a withered ancient tree, shattering at a mere touch.