Day 17: At the halfway point of Inferno, Dante unleashes a torrent of similes and turns right

Not to get too grammatically geeky, but one could spend a lifetime scouring, analyzing a debating the metaphors that are omnipresent in the Divine Comedy.  In each circle, terrace or sphere, Dante is confronted with the metaphoric representation of a particular virtue or vice.  The whole epic could be described as a metaphor for the transformation of desire.  It is quite interesting, then, that as we are in the center of the first book, Dante unleashing a string of similes, perhaps totally all the similes we have seen so far.  That, and the quite uncharacteristically melodramatic episode that overwhelms Dante at the end of the canto, make this a memorable, unique read. 
We begin right where we left off with the cliffhanger from last canto.  Virgil and Dante are confronted with a beast that emerges from the fiery river.  And here come the similes.  The creature had a face of a man, but his trunk was as a serpent.  His arms were hairy as a wolf or bear.  And his flanks were adorned with knots and circles as elaborate as any turkish tapestry or any web Arachne wove.  The beast arose from the liquid as a boat half submerged.  The beast positioned himself with his tail, which was as a scorpion's, like a beaver defending it's damn.  Dante is descrbing the mythical three faced Geryon, but it has also been speculated that this beast is the fabled Manticore. But what a string of similes! 
There is also another interesting tidbit to do with the trajectory of Dante's quest.  Up until this moment, Dante and Virgil have descended only by turning left.  But here in Canto 17, they turn right.  Virgil even makes a point to say "now we'd better bend our path a little, till we reach as far as that malicious beast which crouches over there."  I have a little theory about this, and am probably way off base.  Their journey is one of descension through hell towards righteousness.  But at this moment, they need the aid of a damned soul in order to traverse the fiery river.  So consequently, in a very brief sidestep, they divert from their path to utilize this damned beast.  It is a moment of using evil for the purpose of good. 
But look at the consequences for this action.  We are privy to Dante the poet unleashing a brief melodramatic exposition, as he observes from the back of the Geryon the scene further down in Inferno.  Dante is overwhelmed by fear and dread, "There i was more afraid of falling off, for i saw fires and I heard laments at which I tremble, crouching and hold fast."  He describes his fear as Icarus making his fateful voyage, as well as Phaethron losing control of the chariot which guides the son on its orbit (again with the similes).  But it is curious, because Dante has been in hell for while now, and seem some pretty horific stuff up to this point.  Does this moment when fear immobilizes him have something to do with the clear departure from their movement left?  It certainly seems to be connected somehow. 
The canto ends with finally another simile.  While Dante was so dsitracted by fear, the Geryon has set him and virgil down, like a falcoln who's flight was unseen by its falconer, returns to his arm.  Once again, Dante and Virgil continue their journey downward to the left.  The paralysis is gone and the similes become metaphors.