Monstrous bite as area attack

[Azinctus]

Following on from the Tyrannosaur vs skilled swordsman thread. I am making up a huge biter for Dungeon Fantasy. I want to use Area Effect to make a bite that is impossible to parry.

So for an SM +5, born biter +1 with an effective 90 strength and Brawling 18, I have something like this:

Huge Bite: Crushing attack 10D+10 (Brawling, Area Effect, 1 hex, range 5, bulk and acc are 0 'cause its really a melee attack)

Notes: 1. This natural weapon attack cannot be parried, however a successful parry will permit the defender to roll an attack as per B.376 Parrying Unarmed Attacks, the resulting injury could save a lucky fighter.

2. This attack begins a grapple as per MA.115 Teeth.

3. Special limitation: This attack should only be used against targets that are two or more SM's smaller than the attacker and significantly less strong (superman can parry dinosaurs, so don't use this attack on sup').

This power is meant to work like this: monster makes a Brawling hit roll (can be deceptive, rapid strike etc) to attack any hex within five yards. Everyone in that hex can try a parry to injure the beast, or to leave the hex with dodge and retreat (no +3 for retreating) or a dodge and dive and get +3 to dodge. Should a shield's DB make the difference in a dodge or parry resolve full attack damage against the shield immediately and carry on (no overpenetration since its a crushing attack). A successful dodge results in no damage. Any failure to dodge or after a successful parry, if the creature is still standing, results in Large Area Damage. The target is also grappled (probably by the torso) and can be pinned while standing.

Questions: Can anyone help me make that closer to the RAW? It's for an NPC so points costs aren't strictly important but it might be nice to know if anyone can estimate that. I got to 50+ points then discovered that Area Effect doesn't do one hex and gave up. At what point does a bite and pin become swallow? Am I right that dodge and retreat out of an area doesn't give the +3 to dodge?