Just because Dodge default is DEXx2% + agility (which is not often above +5%) - 1% per ENC (up to carrying capacity) - 5% per ENC (above carrying capacity), and fist is 25 % + manipulation (which is often +10%), because attack and parry are same skill. In my character's case, that means 25% dodge (2*14+10-13) and 40% fist (25+15), and the 15% difference is life saving. In addition, if the attack is a special, the dodge must also be a special to succeed, not the parry.