I got it

Raja then said, "Hold on. You can't see it either? Then how can you be sure?"

And Gen said, "I can be sure because Guna and I have been training this technique for a few months now."

"You are training the technique he is using? How is that possible?"

"Do you remember my junior brother? He left a book with Guna, right? Inside that book it was written how to use this technique, but Guna and I, even after studying the book for months, never understood how to put it into practice, but now that I've seen someone using it I finally understand, and I'm sure Guna will understand too, it's just a matter of time."

"Well, I hope you're right, after all, it doesn't look like Guna will last long if he keeps taking these punches from his opponent."