I don't mean to nit-pick but I think that AoE attack of the slugs is either on a timer, or completely random. I've come around a corner having just seen a slug finish that move with no one else around. Before it was theorized that if you stepped on them they AoE'd, but I've seen it never happen, or just be one of those things that happens as you pass on by.
Like a belch or something. Ahahaha.
I wish they hadn't gotten rid of the curiosity of certain mobs like Efts, now they just attack immediately. ): With mobs like goats now no longer following people, it's also a shame...But with melee attacks being AoE with no control over it, it was an issue ahaha.