ballgame99 wroteIf taking a shoulder to the ribcage isn't disadvantaged, then I'm not sure what is.
That's not a disadvantage unless it prevents him from performing normal defensive actions. I'll agree disadvantage here is minimal. However, displacement seems sufficient here.
I'd probably call the PC and wouldn't give a rat's rump about the grief I took. It's possible I'd no-call it, too. It's really hard to say.