At the moment, calling a new "spell cast" delay while another is going on overlaps the display for the first one. It is unclear if the first delay is still going on, or if the workflow continues past that first delay (needs investigating).

• There should be an option to prevent overlapping "spell cast" delays - preventing a delay and stopping the workflow if it tries to overlap an "unoverlappable" cast. (maybe regular delays as well ? We'll see.)
• If "spell cast" delays are overlapped, the first workflow shouldn't continue if it does, as it would create confusion.