question on dual weapon attack order and repelling

[Ming]

If the attacker has weapons length (say) 5 and 0 and defender has weapon length 4, presumably there would be a repelling check on the attack by weapon length 0, but would it be before of after the attack by weapon length 5, or is the order random? i.e. would the repelling be first reduced by the attack from the length 5 weapon before tackling the length 0 weapon?