Mendechaus will give unit lost shoutouts ("Skarg lost" // "Your units are being wiped out.") when the creatures are experiencing intentional deaths. Noticed this while playing Lamash and regularly sacrificing units by dropping them onto crypt pyres or executing them in the torture chamber.
The player already knows these creatures are dying, so it's unnecessary information. Plus it can be confusing when you're fighting someone at the time and hear "Your units are being wiped out" because you ushered a bunch of gnarlings into the decontamination chamber.
Similar interactions i'm unsure about;
Sacrifice // Summon Vampire
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