Rishi saw that while the Wyvern Riders were patrolling the area, their numbers were not that large; only fifty were patrolling. They were taking turns. Giving these guys time to react was not the right decision, as they were weak and helpless while they were not in the air.
It was like fighting an aircraft on land compared to the sky. No matter how advanced it was, the aircraft would be vulnerable. From his past experience, he knew taking them down was not easy when they were in the air. It also increased the chance of some of them slipping away.
So he had decided not to give them any chance to fly. He carefully scanned the area and formulated the best plan. From what he could see, this town was not that big like the previous one; this one had fewer lizards. His plan was divided into three simple steps.
First, shoot down the opponents in the air.
Second: Ambush the ones on the ground, preparing to fly.
Third: Eliminate all.