Unclear meaning of startNextBeam()

[ScruffR]

I don't quite get why on earth there is special treatment of only _beamCount == 2 and _scrollDir == LEFT 😕
What's in all the other cases???

void Beam::startNextBeam(){
    Serial.println(_scrollDir);
    Serial.println(_beamCount);
    Serial.println(beamNumber);

    /*start playing beams depending on scroll direction*/
    if (_scrollDir == LEFT){
      if (_beamCount == 2){
        sendWriteCmd(BEAMA, CTRL, SHDN, 0x03);
      } 
    }
}