I was soloing Catacombs on Hard earlier and the enemy count or something got screwed up. There were five or so enemies (three Crawlers and two Clots) in the Trader round, and later on there were two Gorefasts when it said there was 1 enemy remaining. Here's some screenshots:
http://i.imgur.com/0aRNKxO.jpg
http://i.imgur.com/RAesAX3.jpg
http://i.imgur.com/cIvkCN8.jpg
http://i.imgur.com/OKiFdWh.jpg
http://i.imgur.com/WVks0Qx.jpg
http://i.imgur.com/0aRNKxO.jpg
http://i.imgur.com/RAesAX3.jpg
http://i.imgur.com/cIvkCN8.jpg
http://i.imgur.com/OKiFdWh.jpg
http://i.imgur.com/WVks0Qx.jpg