A SM+2 mecha (6 tons, ST85, Basic Lift 0.72 tons) wanted to curb-stomp a downed giant leader. That leader is SM+4, weighs 12 tons, and is ST160. He’s also got Wrestling at DX+4, which is a +3 bonus per ST 10, or basically +30% to ST. The giant has a crippled leg (and a wounded arm) as well. If they actually grapple, the giant will be at +2 to DX and +30% to ST or Trained ST when grapplling due to the difference in relative size modifier.
They’re using the Technical Grappling rules for extreme grappling awesomeness.
So here’s the situation: the mecha kicks at the giant, and the giant successfully performs a one-handed grabbing parry. The question was, basically, what the hell happens, and what should the giant do next?
Grabbing Parry was a modification and generalization of Hand Catch from Martial Arts, and has some similarities with Aggressive Parry. You defend at some significant penalties (-2 to start, and then more for what you’re trying to actually parry, and very, very high penalties if you’re defending against weapons.
Even so, many grappling parries are one-handed, and the point of a Grappling Parry is not, in fact, to get an awesome grip. It’s to get even a 0 CP grip, so that you don’t have to make a separate attack roll to achieve a grapple on your own turn. You can proceed to improve your grip, change position or orientation, attempt a lock, etc.
For those reasons, the CP inflicted by the Grabbing Parry are limited to ST/2 (the assumption for unimproved one-handed ST) with no training bonus. You also don’t get any boosts for relative size modifier until after you’ve already secured a grapple.
In this case, the giant will be rolling vs a one-handed ST 80, with no training or size bonuses. That’s 9d control points. The following turn, his own turn, he’s now grappling, and all the skill and size bonuses apply.
Two-Handed Trained ST: ST 160 x 1.3 (from Wrestling at DX+4) and another 30% boost from +2 relative size modifier means his final ST vs the mecha, with two hands, is ST 208 with a training bonus of +48 (that’s separated out for a reason), for a total two-handed Trained ST of ST 256.
With a one-handed grapple, you start with ST 80, but the training bonus is supposed to be a flat add, for ST 128, and then the size boost would make a one-handed Trained ST 166.
Making the Training Bonus path dependent made sense when I wrote it, but does make the math a bit more cumbersome.
Anyway, a successful Grabbing Parry allows an initial 9d CP (average about 31 or 32 CP), and the ST of the mecha means he’s at -1 DX for ever 16 CP applied. So the grabbing parry will, on the average apply about a -2 penalty to the DX of the mecha from the get-go.
The Follow Up
On the giant’s turn, if he can do so, he’ll want to attack with a two-handed grapple. He’s prone (but maybe he has Ground Fighting), but skilled. At worst he’s probably rolling at DX to DX+4.
But he’s got a grapple, so there’s no reason not to double the awesome and just go right for a Leg Lock. This is an attack roll with his Lock technique, which defaults to flat Wrestling. A two-handed grapple will lock the mecha’s leg and inflict 26d extra CP. That’s an extra 91 CP, making a total of about 122 CP, which will be -7 to DX from the grapple on the leg.
With such high penalties, the mecha will be hard pressed to successful parry.
Next (or even at the same time, if Mr. Giant wants to Rapid Strike or All-Out Attack (Double) and lose his defenses) it’s in the giant’s best interests to establish a weight advantage. The giant’s weight of 12 tons much exceeds the mecha’s 0.72-ton basic lift, and so establishing a weight advantage will put the mecha at a -13 penalty based on exceeding the 16xBL threshold on p. 8.
In fact, the weight advantage is so advantageous that it’s probably a better move overall than establishing some sort of fancy-pants leg lock.
If the giant can establish the weight advantage, the mecha will be at a huge penalty to do any sort of mass-based move, or resist one – explicitly including attacking to break free. Between the CP from any sort of leg lock, plus the penalties due to the mass, well . . . the “pin” may have been removed formally, but at this point the mecha will likely be pretty helpless.
To make it worse, the giant can attempt a takedown, and since that’s a mass-based move, the mecha is still at -13 to resist it in the Quick Contest.
Ultimately, what this shows is that mass matters, and being outmassed by 2x, with another 2x difference in ST (and 4x in lifting power) means that getting grabbed by such a foe is going to render you pretty powerless to resist.
I found the same thing when grappling a guy who outmassed me by about 50% at the time, and he was certainly not double my ST either, but while I was able to grapple with him pretty effectively using skill and agility (but I wasn’t allowed to choke him out or torque his limbs, since he was a beginner), when he got on top of me by throwing his weight around, he rapidly crushed me under his weight, leaving me pretty helpless, especially since pressure point techniques and other things that didn’t rely on strength, leverage, and weight were forbidden to me.
But still: the mecha is doubly in trouble. He’s been the victim of a grappling parry by a stronger, heavier foe. If he can’t escape, either through a Change Position maneuver, or a follow-up grapple or lock, he’s rapidly going nowhere fast, even with a foe with a crippled leg.