Because it fell from the skies like a rain of deadly thread, consuming all it touched, animal, man, and vegetable.
About a planet where certain humans are able to "impress" a dragon hatchling, with the pairs going on together to fight the deadly "thread" which falls from the skies, I loved them partly because I was desperate for a dragon of my own.
As I bent and picked up Buddy's pinchbar, the spider began to wrap Dan in its deadly thread, and his struggles became a grisly, jittering death dance.
Rusten, ahead of him and still charging toward the Druid, was caught in a crossfire of deadly threads and cut apart while still on his feet, screaming as he died.
He saw her stumble and go down, struck by one of the deadly threads, and then he lost sight of everything but what was happening right in front of him.