The compact whirlpools like mine does the same thing. It drains for a few minutes without spinning the tub. The mechanicals however are a bit different. These washers do not have a transmission, but agitate by changing the direction of the motor. To spin, the brake locks the wash tub and the agitator together, and then the two go off and run at the same time in one direction. The solenoid brake, when activated, frees the brake, and is also electrically connected to the water drain pump, so when the washer starts the spin/drain mode, you hear a clunk, the hum of the water pump, and the gurgle of the water draining out. Then, a few minutes later the whirring of the motor as it gets the tub up to speed.
Works pretty well I've noticed. The clothes seem to distribute within the tub well for minimal shaking during spin.