Would this work in groundfighting?

[IronFist]

Ok, say you're grappling with some guy. What if instead of relying on grappling techniques like locks and positioning and stuff, what if you had a serious like death-grip and grabbed his traps and jammed your thumbs between his collar bones and traps and just like tore out the muscle? That would stop me.

[SanSoo Student]

Sounds vicious enough so it should work, I just feel sorry for the person your trying it on. Tore out muscle, you mean sticking your fingernails into their skin and ripping out chunks of their muscle as you tear off their skin, then yes that would work.
Having the collar bone muscle ripped out would hurt like a B!TCH!

[SifuAbel]

Naw, thats hard to do.

Now, if you dug your fingers into the inside rim of his collar bone and squeezed with your thumb around his trachea you might get a momentary flinch.