The instant you pull on the collective, both lift and drag increase. The greatestlift increase takes place where the max angle of attack changes take place [which is when the advancing blade is at 90 degrees to the airflow] (3 o clock for anti clockwise rotation and 9 o clock for clockwise rotation). Drag also increases but this is compensated for by the rotor governor. Because the effect of this lift is not felt for another 90 degrees, approx (dependant on rotor head design); then the outcome is a tilting up of the main rotor at the front of the disc. This phenomenon is instantaneous whereas the influence of the tail stabilisers is secondary (after the a/c starts its climb).
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TC