Stalling a blade usually only happens in high speed forward flight and at high weights.
The retreating blade has less relative airflow to work with so must operate at a higher AoA, so it will stall first, most dramatically at the tips. There will be roughness, vibration, then the nose will pitch up and it will roll to one side or the other, depending on the direction of rotation.
Remedy - lower collective, slow down, change underwear.