The simplest thing is that the Cardinal System holds something that's similar to Accel World's Incarnate System: transcending the boundaries of the system by the force of one's will.
Note that earlier, when Asuna ran to save Kirito, she was running at a speed of 60km/h (my calc), which Kirito notes in the LNs to be flat-out impossible, as it exceeds the system parameters.
Also, by pure will, she managed to stand up and tank Heathcliff's blow, despite being under the Paralysis status effect.
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