Added after 35 minutes
Never mind, the issue is resolved. That file was deleted, I created a proper trigger in the map. Now, two new questions have appeared:
1) How do I assign multiple animations to monsters at once? When I try to make several placed monsters rejoice, I can only select the first one (the others simply aren't visible when I click "...")
Issue resolved - I just needed to press the '9' key on the mini-keyboard.
2) How do I remove the hero's name when the text is displayed? It appears like this: Nimues: "my text". Is it possible to remove the "Nimues" label or replace it with the name used in the map?