(spoilers)
Hmm, I really think the hysteria would fade and Leo would see reality and chose to join Chase.... I kinda find that a better outcome then Leo being in psychiatric prison for the rest of his life! I wonder if the thing he saw was the socketman?
I don't know about that, I think only Chase is going to be seen in Arches. I hope maybe Leo is shown though, and he has a better outcome and isn't depressed for life.