Yakman invulnerability glitch
A cross-platform port of Hexen II game.
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The Yakman enemies in the expansion can choose to block, in this state any damage is negated for them. Unfortunately there's a glitch where his invulnerable state persists after blocking. I don't know what causes it but the attached demo demonstrates the problem. I altered it so the Yakman glows when he is invulnerable, this feature apparently got saved in the demo so it'll show up even with a standard progs.dat.
Also worth pointing out in that demo is the Sun Staff glow doesn't switch off when I switch the weapon away, but that's pretty minor.
Tested with r5337 Linux amd64, it shouldn't matter what version you use though.
I think even the original vanilla copy of the game had this bug.