
CLufaS |
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Grappling allows you to make an attack with a one handed weapon without anything extra. Cinematic aspects aside you would just need Improved Grapple so you don't provoke and maybe a couple other feats to get your CMB up. That or using the called shot rules which are equally difficult to implement effectively. There may be another way but it'll be messy as hell. The reason is in part because it shouldn't be able to happen to you either.
If I were running it I'd treat that as something similar to a sneak attack. If you stealth up on someone unawares I'd have you roll sneak attack if you hit you get into the 'will slit your throat' position but forego damage until you decide to take an immediate action to finalize the attack. I'd also give you a bonus to Intimidate and Diplomacy if you have a friendly discussion about things. Arguably that wouldn't work with everyone but mooks, sure.