I guess its probably since either side can still get checkmated, although it is not at all forced. Its times like these enabling pre-moves is extremely useful as you just can shuffle your piece back and forth without losing time.
Why????
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if 2 people are downb to a horse and a bishop and a king aside why doesnt it AUTOMATICALLY deafault it as a tie instead of the stupid dumbie trying to wind the time down to zero an win