In the open fields, there was no choice; the situation was stronger than the individual. As a distressed wanderer, he found it difficult to resist the local lord's heir, so he had to tell him stories. He had previously imagined various scenarios of meeting Oda Nobunaga. Considering Amman said Nobunaga was a "seasoned oddity" and had been under long-term constraints, he figured his personality might be very rebellious. Showing weakness probably wouldn't work, so he had to pique Nobunaga's interest. That's why he started to pull on the iron cannon topic.
Now looking at the effect, it wasn't bad at all. Oda Nobunaga really liked these novel things, so it seemed he wouldn't be too hard on him soon.