Having discerned Granny Kasi's inner thoughts, Tyler gained further insight into his predicament.
He surmised that, in the worst case scenario, the "unknown enemy" was already aware of his identity as an otherworldly traveler.
Granny Kasi was the enemy's informant, assigned to keep a watchful eye on him.
The enemy refrained from having Granny Kasi take direct action, likely because their objective necessitated personally dealing with him.
At present, the "unknown enemy" was unable to execute their plan for some reason, but sooner or later, the one that unleashed a sky-high pillar of fire in Ira Village would reappear.
Tyler was not afraid of being targeted by the enemy; his fear stemmed from not knowing their identity.
Since he was now aware that Granny Kasi was the enemy's informant, and his mind-reading ability remained concealed, he could actually exploit Granny Kasi to inadvertently feed false information to the enemy.