I ran into this when I first started, quickly left and never bothered with it again after triggering a few of the monster summons. I decided to check it out again with my current character. I am completely and utterly confused by the "puzzle" aspect of this dungeon and I don't consider myself a neophyte with puzzles (30years of designing and running aD&D/rpg campaigns = some familiarity with puzzles.)
The lines of the poem make no sense. Reordering the lines does not make them clearer. I managed to somehow have one of the "orbs?" turn on instead of throwing mobs at me. But since there is nothing remarkable about that room I have to assume it is just random. Unfortunately going back and touching each of the other "orbs?" does not produce any different results.
So I guess I am stuck on this. :/