I was fooling around with WW7. Two things happened that were funny:

I was in Nighon and one of the Fire Witches turned to one of the Peasants and zapped him. My screen showed all green. And the Zappee was just a peasant wandering around the Village. The witch went back to patrolling. I've seen monster fight each other in the game, but not a random killing.

Then I went to the arena, and I'm getting hit by a Manicore except I cannot see him. I couldn't remember if that was correct or not and it was interesting using Wizard Eye alone to target and shoot. Got him so I went on. The next arena I had several manicores but, again, could only see them with Wizard Eye. This time when I got one, the game crashed so I have a corrupt file. But I liked having to fight an invisible creature.

Edit for clarity and spelling.

That time of the month maybe?

Afaik it is a bug, that appears when you turn on 3D Hardware Graphics in the setup. But I'm not sure.