New feat: River Fighter Initiate (Tactical)

[Boci]

Okay, so:

River Fighter Initiate (Tactical)
You can harness the flow of combat, guiding an otherwise random affect to aid you in battle.
Preq: Dex 13, 3 setting sun manoeuvre, 1 of which must be of at least 3rd level,
Benefit: You may use the following tactical manoeuvre:
Exploit armour: When you initiate a trip or bullrush attempt, your opponent takes a penalty on the opposed roll equal to their Armour Check Penalty.
Fall back: When a critical hit is confirmed against you in melee, you may allow the sheer force of the blow to send you 5ft backwards. You must make a successful DC: 15 tumble check to avoid provoking an AoO with this movement, and a balance check at the same DC to avoid falling prone in your new location. You may use this ability even on difficult terrain, but it does not allow you to occupy an illegal square or path through a barrier.
Torrential step: When you ready an action to attack an opponent, you may then take a 5ft step into their square. If the attack was successful, this movement does not provoke an AoO.

This one better?

Extra mass HELPS with not getting pushed back usually... I can't THINK of any way training could turn mass of the pushee to the pushers advantage... you could use it to fake them out, but that is either Tumble or over-run, not really Bull-rush I wouldn't think.

I am pretty sure that a heavy suit of metal that impedes your movement can be used against you to force you backwards by someone who knows what they are doing. Kick at one leg and the added mass will make tyhem stumble back more easily.