There were now only ten Skrewts left; apparently their desire to kill each other had not been exercised out of them. Each of them were approaching six feet in length. Their thick grey armour, their powerful scuttling legs, their fire-blasting ends, their stings and their suckers, combined to make the Skrewts the most repulsive things Harry had ever seen.
The Hemlock Essence is located between the legs of the Skrewt facing Harry and Ron.
If you mouse over the Skrewts they will move and throw fire. There are feathers in from of Hagrid that blow up. Mouse over Ron and Harry to see them blast magic from their wands. Mouse over the area in front of the girl to see dust billow up.
You can hear the Skrewts scratching the wooden boxes, and fire cracking.