Thats what it says:
http://zelda.wikia.com/wiki/Zant
Zant opened a portal to Hyrule and began a conquest of the land. After a series of successful campaigns, Zant's army attacked Hyrule Castle. The Hylian Knights defending the Throne Room were defeated in the ensuing battle, and Princess Zelda was forced to abdicate the throne to Zant to save the lives of her people. He covered the provinces of Hyrule in Twilight, turning the inhabitants into spirits.
Is there even a video or scene showing him doing this? it sounds the sort of move thats extremely slow or at least ineffective. Kain could escape it anyway.
Originally posted by Gumachi
If he teleports away, how can he slash Ganon?
I am listing his choices, he could either teleport away to create the repel shield to stop magic and his time field so that his opponents are screwed if he teleports next to them. Or he could teleport slash Ganon and Kratos.