Replacement Player

[SmokeEater]

Situation: NCAA rules

A1 drives to basket and is fouled and goes down briefly looking like he might be hurt. Coach rushes to baseline to see if player is ok and helps A1 off the floor. A1 brushes coach aside and goes back onto the court. At no time did the coach get beckoned to the player or did he enter the playing surface.

Question?

Does the player have to be substituted? What reference can I check? Is there a penalty that the coach should have received?

Thanks, I think I may have booted this situation this weekend.