I agree that the steps are very dangerous without any sort of barrier!
The enclosure does continue to the right of my photo. I thought it was a decent sized enclosure for otters (which is handy, as I think I counted nine of them in their indoor area!!)
if I remember rightly, the slabs are grooved which is indication of a road or step for a blind person. There are bright lines painted on the edges of the steps for partially-sighted people to see where they end. If yr just not looking where you're going, well....