c 'disrupt flesh' storm
You disrupt an elite storm giant soldier's flesh!
Your disruption *** DEVASTATES *** an elite storm giant soldier!
You can't learn the nuances of disrupt flesh since an elite storm giant soldier is immune to your attack!
An elite storm giant soldier is convulsing on the ground.

It's immune to your weapon. This is the exact case that piece of code is for.

It seems like you get this same bug report constantly. Making a few extra messages to describe it more accurately could constitute a "fix."

Can you just change it to:
You can't learn the nuances of disrupt flesh since an elite storm giant soldier is immune to your weapon!

Or if differentiating the cause is annoying, how about:

You can't learn the nuances of disrupt flesh since an elite storm giant soldier is immune to your attack or melee blows!

Because like everyone else when I see the message it has now, it sounds like "the attack you just hit him with" not "the attacks you swung at him last round"

I mean it's an unintuitive, unrealistic mechanic just meant to make practicing more difficult anyway. It's not like that text is really valuable IC content that needs to have a lot of flavor.

You can't learn the nuances of disrupt flesh since an elite storm giant soldier is immune to your <insert damage type here>, from whichever weapon triggered it.