Capturing high-level nests.

So, if the angel's morality kicks in, he'll just write "gg" and that's it. That's exactly how online games go for the local "pro" players.

Why "gg"? The army isn't in battle; if things get heated, just retreat, and that's it. You'll only lose 2500 for the ransom and, possibly, a ballista.
And even the hero-artilleryman doesn't always go for the long-term "pro" strategy, so even his death isn't necessarily "gg," especially since the remaining unit can be finished off with the army.