On-Side Kickoff Rules for Receiving Team

[Rolling Wolf]

High School Football, North Carolina; Is there any rule that prohibits the receiving team on an on-inside kick that prohibits the receiving team from sending players across the 50 yard line to block the kickoff team players as they chase the on-side kick as it is rolling toward the 50 yard line.
I am about to face a team that utilizes the kicker to roll the ball straight ahead and he and 4 other defenders (tightly grouped with the kicker) chase the ball and try to recover it just as it crosses the 10 yard rule at the 50 yard line. They come in extremely hard and delivers shots at the receiving player.