Igor's inexplicable confidence utterly shattered Kadi. Despite how vivid Igor's explanations were, Kadi was baffled and overwhelmed. He could not understand why he had to play the role of a guide, nor why his panicked state suddenly dissipated. The sound of Igor's rambling seemed to hold some magical power, calming him down and erasing any worries.
I find the Red Leaf Tree quite strange. I've always wondered why its leaves turn green in early summer, yet change to red during Warm Winter.
Even then, Igor was still pondering the Red Leaf Tree... Though Kadi was utterly confused, his spirit, thoroughly crushed, left him with no energy to retaliate. He felt like a lamb to the slaughter, at the mercy of Ghost Wind Valley.
However, a sliver of hope remained in Kadi's heart—a hope Igor had given him. Though tiny, it represented a shred of respect for Igor, his rare human friend. Beyond this reluctant trust, Kadi had abandoned all hope of escaping Ghost Wind Valley.