Have my henchmen better perception than me?

I was fighting Arachnoss with my zombies (i am a Necro/Dark MM), and we found a Night Widow. She used a smoke grenade (or whatever she uses for hiding), and I could not see her anymore... but my pets still attacked her! (well... they attacked 'something invisible with orange numbers on its head' )

I watched the icons, and all we had a smoke icon (-acc, -perception). Have my henchmen better perception than me?

Pet's will chase down things they can't see that they were told to attack or were attacking when they dissapeared.Or at least from my experience they do.

I know Thug's have better sight than me due to the Enforcer's but wouldn't think Zombies do.

I actually think that they do, My bots constantly hit Night Nidows and other invisible targets that I can't see as long as they arn't at 'Heel'

Better be quiet though, Don't want the DEVs learning about this.