Demons + autoassisting mobs

I don't know if this is a bug or not, but it doesn't seem right that the arial guards assist demons. <95%hp [1151] 100%m 23%mv 24900tnl civilized indoor 5 AM> You yell 'Help! I'm being attacked by an air elemental!' You keep an air elemental at bay with your polearm. You dodge an air elemental's blast. You keep an air elemental at bay with your polearm. You yell 'Help! I'm being attacked by a winged morosa demon!' You keep a winged morosa demon at bay with your polearm. A winged morosa demon's slice EVISCERATES you! You dodge an air elemental's blast. You keep an air elemental at bay with your polearm. You parry an air elemental's blast. You dodge a winged morosa demon's slice. A winged morosa demon's slice DISMEMBERS you! The evil looking guard screams and attacks you! You keep the evil looking guard at bay with your polearm. The evil looking guard screams and attacks you! You keep the evil looking guard at bay with your polearm. You keep the evil looking guard at bay with your polearm. Your claw misses Kanaev. Kanaev swats your claw away with his shield. You keep Kanaev at bay with your polearm. You parry Kanaev's digestion. You parry the evil looking guard's slice. The evil looking guard screams and attacks you! You keep the evil looking guard at bay with your polearm. You keep the evil looking guard at bay with your polearm. You dodge the evil looking guard's slice. Kanaev has a few scratches.