Perhaps I'm just an oddball, but I've never seen any relationship between what's often referred to as having been "emotionally hardened" and actually being any good at overpowering someone in a violent situation.
Have you ever watched "Breaking Bad"? The main character is a withered, dying-of-cancer teacher... but you wouldn't mess with him in a violent situation, because the guy
will not back down... if he's threatening you, he's going to go through with it regardless of consequences to himself and that is
scary! He's fully dedicated to what he's doing and that emotional/mental intensity sees him through physically tough times.
Hard is also
will... the drive to see things through... it's also meanness and hard-heartedness, etc, not just being big and buff and warlike.
Remember, you're playing
in the fiction,
to do it, do it.
So, if the 98lbs weakling Angel says to the above ganger, "Get out or I'll wrestle you to the ground and throw you out!", that's an attempt to
Manipulate, because, fictionally, the PC can't actually back up that threat with a physical effect... heck, it might not even count as a manipulate, and the ganger might just laugh it off.
If the 98lbs weakling Angel instead says to the above ganger, "If you don't get out, I'm going to come over there and use this scalpel to slice off your balls." that is Going Aggro as the ganger will see that this little fucking twig has the
will to come over there and do that... they aren't bluffing, you can see it in their eyes.
If that same Angel said, "I'm going to attack that whole gang with my scalpel, and claim the girl they have", the MC has every right to say, "You know, that's probably going to get you killed..." and modify the Seize By Force with a penalty or some other factor... as the fiction demands.