He has already activated diamond physique and Juggernaut's Armament. That makes two defenses on top of his armor to protect himself with.
He couldn't be bothered to hide his abilities with his life at stake. He wanted an opportunity to go all out, and he has got it. But he still wasn't confident that he would be able to survive the fall.
He promised himself, "I should get a flying ability soon."
Then he shook his head and chuckled. "I doubt flying would be better in this situation. It might make me attract hostile attention to myself and be shot down."
He knows about the spike-throwing trees as he read about them in the dossier of the Lignum world. It is just that they were supposed to be smaller and weaker.
They were small trees that hunted flying birds who were attracted to their fruits. The bird would die and fertilize the ground near the roots of the tree.
